Iridescent Sharks Care: Tank Setup, Diet, Tank Mates, Diseases & More!

If you are looking for a unique and eye-catching addition to your aquarium, Iridescent Sharks may be the perfect choice for you. These freshwater fish are known for their shimmering scales that reflect a rainbow of colors, making them a popular choice among hobbyists. However, before you bring home an Iridescent Shark, it’s important to understand their care requirements to ensure they thrive in your tank.

Iridescent Sharks is a freshwater fish species that requires a minimum tank size of 200 gallons. They prefer a pH range of 6.5-7.5 and moderate water flow. They are omnivorous and should be fed a varied diet of pellets, flakes, and live/frozen foods. Regular water changes and proper filtration are necessary for their well-being.

First and foremost, it’s important to note that Iridescent Sharks can grow quite large, reaching up to three feet in length. As such, they require a spacious aquarium with plenty of room to swim. A tank size of at least 200 gallons is recommended for a single adult Iridescent Shark, with additional space needed for each additional fish.

Additionally, Iridescent Sharks are active swimmers and require a strong current in their tank. A high-quality filtration system is necessary to maintain good water quality and keep up with the waste produced by these fish. You may also want to consider adding some hiding places or decorations to the tank to provide your Iridescent Sharks with some privacy and shelter.

Iridescent Sharks Care 2

Species Summary


The Iridescent Shark, also known as the Siamese Shark or Sutchi Catfish, is native to Southeast Asia, particularly the Mekong basin in Thailand and Laos.

They are commonly found in rivers, streams, and canals.


These fish can live up to 20 years with proper care and maintenance.


The Iridescent Shark has a sleek, elongated body that is silver in color with black markings on its fins and tail.

They have a distinctive iridescent shine when seen in the right light.


These fish can grow up to 3 feet long in captivity, although they typically only reach around 1-2 feet in length.

Growth rate

The growth rate of Iridescent Sharks can vary depending on factors such as water quality and diet.

On average, they grow around 1-2 inches per month.

Behavior & Temperament

Iridescent Sharks are active and social fish that prefer to be kept in groups of 3-4 or more.

They are peaceful towards other fish, but can become aggressive towards their own kind if they feel overcrowded or threatened. They are also known to jump out of tanks, so a secure lid is necessary.

Male vs Female

It can be difficult to distinguish between male and female Iridescent Sharks, as they do not have any external differences.

The only way to accurately determine their sex is through dissection or breeding.

Personally, I have found Iridescent Sharks to be fascinating and beautiful fish to keep. Their unique appearance and active behavior make them a great addition to any aquarium. However, it is important to provide them with adequate space and a proper diet to ensure their health and longevity.

Tank Setup

Proper tank setup is crucial for the health and well-being of your iridescent sharks.

Here are some key factors to consider when setting up your tank:

Tank size

Iridescent sharks can grow quite large, reaching up to 4 feet in length.

Therefore, it is important to provide them with a spacious tank. A minimum tank size of 200 gallons is recommended for a single iridescent shark, with an additional 50 gallons per additional fish.


While iridescent sharks do not require special lighting, it is important to provide them with a regular light cycle. A 12-hour light cycle is recommended, with a period of darkness at night to simulate their natural habitat.

Filtration & Aeration

Iridescent sharks are sensitive to poor water quality, so a high-quality filtration system is essential.

A canister filter or a sump filter is recommended, along with regular water changes. Additionally, aeration is important to ensure adequate oxygen levels in the water.


Iridescent sharks are tropical fish and require a consistent water temperature between 72-82°F.

A submersible heater is recommended to maintain the appropriate temperature.


A fine gravel or sand substrate is recommended for iridescent sharks. Avoid using sharp or coarse substrates, as they can damage the fish’s delicate barbels.


Iridescent sharks are active swimmers and require plenty of open swimming space.

However, they also appreciate hiding places such as caves or driftwood. Avoid using sharp or rough decorations that could harm the fish.


Iridescent sharks do not require live plants in their tank, but they can provide additional hiding places and help to oxygenate the water.

If you choose to include live plants, choose hardy species such as Java fern or Anubias that can withstand the fish’s active swimming.

Iridescent Sharks Care

Overall, providing a well-equipped and spacious tank for your iridescent sharks is key to their health and happiness.

I have found that following these guidelines has helped to keep my iridescent sharks thriving.

Water Quality

Proper water quality is essential for the health and well-being of your iridescent shark.

In this section, we will discuss the key factors that contribute to good water quality: water temperature, water pH, water hardness, and water changes.

Water Temperature

The ideal water temperature for your iridescent shark is between 75 and 80 degrees Fahrenheit.

You can use a heater to maintain a consistent temperature in your tank. It’s important to avoid drastic temperature changes, as this can stress your fish and make them more susceptible to disease.

Water pH

The ideal pH level for your iridescent shark is between 6.5 and 7.5. You can use a pH testing kit to monitor the pH level in your tank.

If the pH level is too high or too low, you can adjust it using a pH adjuster. It’s important to avoid sudden changes in pH level, as this can also stress your fish.

Water Hardness

Iridescent sharks prefer slightly hard water, with a hardness level between 5 and 12 degrees. You can use a water hardness testing kit to monitor the hardness level in your tank.

If the water is too soft or too hard, you can adjust it using a water conditioner.

Water Changes

Regular water changes are crucial for maintaining good water quality in your tank. You should aim to change 25% of the water in your tank every two weeks.

When performing a water change, be sure to use a siphon to remove any debris from the bottom of the tank. You should also add a water conditioner to remove any harmful chemicals from the tap water.

Personally, I have found that maintaining good water quality is the most important factor in keeping my iridescent sharks healthy and happy. By monitoring the water temperature, pH level, and hardness, and performing regular water changes, you can ensure that your fish have a clean and healthy environment to thrive in.

Tank Maintenance

Keeping your iridescent shark tank clean and well-maintained is crucial to the health and happiness of your fish. Here are a few tips to help you keep your tank in top condition:

First, make sure to perform regular water changes. This will help remove any excess waste and debris from the tank, keeping the water clean and clear.

Aim to change out about 25% of the water every two weeks, and be sure to use a water conditioner to remove any chlorine or other harmful chemicals.

Second, keep an eye on your tank’s filter. The filter is responsible for removing waste and debris from the water, so it’s important to make sure it’s working properly.

Clean or replace the filter as needed, and be sure to follow the manufacturer’s instructions for maintenance.

Third, monitor the temperature and pH levels in your tank. Iridescent sharks prefer a water temperature between 75-80 degrees Fahrenheit, and a pH level between 6.5-7.5.

Use a thermometer and pH testing kit to keep an eye on these levels, and make adjustments as needed.

Finally, keep your tank decorations and substrate clean. Use a siphon or gravel vacuum to remove any debris from the substrate, and scrub any decorations with a soft-bristled brush to remove any algae or other buildup.

By following these simple tips, you can help ensure that your iridescent sharks are healthy, happy, and thriving in their tank.

Personally, I have found that keeping a regular maintenance schedule helps me stay on top of things and keeps my iridescent sharks looking and feeling their best. By making tank maintenance a regular part of your routine, you can enjoy a beautiful, healthy aquarium for years to come.

Tank Mates

Compatible Fish Species

If you’re looking to keep Iridescent Sharks with other fish, there are a few species that are compatible.

These include larger, peaceful fish such as Bala Sharks, Silver Dollars, and Tinfoil Barbs. These fish are all similar in size to Iridescent Sharks and can coexist peacefully in a large aquarium.

Incompatible Fish Species

There are also a number of fish species that should not be kept with Iridescent Sharks.

These include smaller fish such as Neon Tetras and Guppies, as well as aggressive fish such as Cichlids and Oscar Fish.

These fish are either too small to coexist with Iridescent Sharks or too aggressive and may harm or stress the sharks.

How Many Iridescent Sharks Should Be Kept Together

When it comes to keeping Iridescent Sharks, it’s important to consider the number of fish you want to keep. While these fish can be kept in groups, it’s important to provide enough space for each fish to establish its own territory.

As a general rule, you should provide at least 200 gallons of water for first Iridescent Shark you keep and additional 50 gallons for each additional one. This means that if you want to keep a group of three sharks, you’ll need a tank that’s at least 300 gallons in size.

Personally, I have found that keeping a group of three Iridescent Sharks together in a large aquarium can be a rewarding experience. These fish are active and social, and watching them swim together can be quite captivating.

However, it’s important to provide plenty of space and hiding places to minimize aggression and ensure that each fish has enough space to establish its own territory.


What To Feed

To keep your Iridescent Shark healthy, it’s important to provide a balanced and varied diet. They are omnivores, so you can feed them a combination of live, frozen, and pellet foods.

Offer them a variety of protein sources such as shrimp, krill, and bloodworms. You can also feed them vegetable matter such as lettuce and spinach.


Feed your Iridescent Shark small amounts of food several times a day. They have a high metabolism and need frequent feedings to stay healthy.

Overfeeding can lead to health problems, so be sure to monitor your fish and adjust the amount of food you give them accordingly.


It’s important to keep your Iridescent Shark’s environment clean to prevent disease and health problems. Remove any uneaten food from the tank after feeding to maintain good water quality.

I have found that feeding my Iridescent Sharks a variety of foods keeps them happy and healthy. I like to offer them a mix of live and frozen foods, as well as high-quality pellets.

I also make sure to clean their tank regularly to keep them healthy and happy.

Common Diseases


Iridescent sharks are generally hardy fish, but they can still fall prey to a number of diseases.

Some of the most common ailments that affect iridescent sharks include bacterial infections, parasitic infestations, and fungal infections.


If your iridescent shark is sick, you may notice a number of symptoms. These can include lethargy, loss of appetite, rapid breathing, or abnormal swimming behavior.

You may also see visible signs of illness, such as discoloration, sores, or other abnormal growths.


If you suspect that your iridescent shark is sick, it’s important to act quickly to prevent the illness from spreading.

Depending on the nature of the disease, treatment options can include antibiotics, antifungal medications, or other medications that are designed to kill parasites or other pathogens.

It’s important to follow the instructions on any medication carefully, and to continue treatment until the illness has been completely eradicated.

Failure to do so can result in a recurrence of the illness, or in the development of antibiotic-resistant strains of bacteria.


The best way to prevent disease in your iridescent sharks is to maintain a clean and healthy aquarium environment.

This means regularly cleaning the tank, removing any uneaten food or waste, and keeping the water properly filtered and oxygenated.

You should also avoid introducing new fish or plants to your aquarium without first quarantining them to ensure that they are free from disease.

And if you do notice any signs of illness in your iridescent sharks, be sure to isolate them from other fish to prevent the spread of infection.

Personally, I’ve found that the best way to keep my iridescent sharks healthy is to maintain a regular cleaning schedule and to monitor their behavior closely. By doing so, I’ve been able to catch potential health problems early and treat them before they become serious.

Signs of a Healthy Iridescent Shark

When it comes to caring for your iridescent shark, it’s important to keep an eye out for signs of good health. Here are a few things to look for:

  1. Active Behavior: A healthy iridescent shark will be active and swim around their tank.
  2. Good Appetite: They should have a healthy appetite and eat regularly.
  3. Clean Skin: Their skin should be clean and free of any growths or discoloration.
  4. Clear Eyes: The eyes should be clear and free of any cloudiness or discharge.
  5. Healthy Fins: The fins should be intact and not show any signs of damage or fraying.

It’s important to keep in mind that these are just a few signs of good health. If you notice anything out of the ordinary with your iridescent shark, it’s always best to consult with a veterinarian or experienced fish keeper.

Personally, I always keep a close eye on my iridescent shark’s behavior and appetite. If I notice any changes in these areas, I take action right away to ensure their health and well-being.

Signs Your Iridescent Shark is Sick

If you’re a fish owner, you know how important it is to keep your fish healthy. Here are some signs that your iridescent shark may be sick:

  1. Loss of appetite
  2. Swimming upside down or sideways
  3. Lethargy
  4. Clamped fins
  5. Visible parasites or white spots on the body
  6. Abnormal breathing or gasping at the surface

If you notice any of these symptoms, it’s important to take action immediately. Sick fish can quickly deteriorate and die if left untreated.

One time, I noticed that my iridescent shark was swimming upside down and seemed lethargic. I immediately tested the water quality and found that the ammonia levels were high.

I did a water change and added some aquarium salt, and within a few hours, my fish was swimming normally again. It’s important to pay attention to your fish and take action quickly if you notice any signs of illness.


Breeding Setup

Before breeding Iridescent Sharks, it is important to set up a breeding tank. The breeding tank should be at least 55 gallons in size and should have a tight-fitting lid to prevent the fish from jumping out.

The water temperature should be between 75-80°F, and the pH should be between 6.5-7.5. Provide a substrate of fine gravel or sand, and add some plants and rocks to the tank to create hiding places for the fish.

How To Breed

When breeding Iridescent Sharks, it is important to have a male and female fish. The male fish will have a slimmer and more streamlined body, while the female fish will be rounder and fuller.

The male fish will also have longer and more pointed fins than the female fish.

Once you have a male and female fish, you can introduce them to the breeding tank. The male fish will begin to court the female fish by swimming around her and displaying his fins.

When the female fish is ready to mate, she will lay her eggs on a flat surface, such as a rock or plant leaf. The male fish will then fertilize the eggs.


After the eggs have been fertilized, it is important to remove the adult fish from the breeding tank to prevent them from eating the eggs. The eggs will hatch in about 3-4 days, and the fry will become free-swimming after another 3-4 days.

At this point, you can start feeding the fry with newly hatched brine shrimp or other small foods. Keep the water clean and well-oxygenated, and provide plenty of hiding places for the fry to avoid predation.

Breeding Iridescent Sharks can be a rewarding experience, but it requires careful planning and attention to detail. With the right setup and care, you can successfully breed these beautiful fish.

Personally, I have bred Iridescent Sharks before and it was a fascinating experience. Watching the courtship behavior and the hatching of the eggs was truly amazing. However, it is important to note that breeding fish can be challenging and requires a lot of effort and dedication.

Product recommendations for Iridescent Sharks:

  1. Fluval FX6 High Performance Canister Filter – This advanced canister filter is perfect for larger Iridescent Shark aquariums, providing powerful and efficient filtration that will keep the water clean and clear.
  2. Seachem Prime  – This water conditioner is perfect for Iridescent Sharks, neutralizing harmful toxins and chemicals in the water and keeping your fish healthy and happy.
  3. Aqueon LED Aquarium Light Fixture – This high-quality LED light fixture is perfect for Iridescent Sharks, providing bright and energy-efficient lighting that will help your fish thrive.
  4. API Aquarium Water Test Kit – This comprehensive test kit is perfect for Iridescent Shark owners, allowing you to monitor the water quality of your aquarium and ensure that your fish are healthy and happy.
  5. Tetra Whisper Air Pump – This powerful and reliable air pump is perfect for Iridescent Sharks, providing a steady flow of oxygenated water that will keep your fish healthy and happy.
  6. API Stress Coat Water Conditioner – This aquarium conditioner is perfect for Iridescent Sharks, reducing stress and promoting healing in your fish by forming a protective slime coat on their skin.
  7. Zoo Med Nano 10 External Canister Filter – This powerful and efficient canister filter is designed for small aquariums and is perfect for keeping the water in your Iridescent Shark tank crystal clear.


By now, you should have a good understanding of what it takes to care for iridescent sharks. Remember that these fish can grow quite large, so make sure you have a tank that can accommodate their size.

It’s important to maintain good water quality and keep the tank clean to prevent disease and other health issues. You should also provide a varied diet that includes both live and frozen foods, as well as some plant matter.

If you’re new to keeping fish, iridescent sharks may not be the best choice for you. They require a bit more care and attention than some other types of fish. However, if you’re up for the challenge, they can be a rewarding and fascinating addition to your aquarium.

Personally, I found that adding iridescent sharks to my tank was a great decision. They are active and playful fish that always keep me entertained. With proper care, they can live for many years and become beloved members of your aquatic family.


If you’re considering getting an Iridescent Shark, you may have some questions about their care. Here are some frequently asked questions:

Q: How big do Iridescent Sharks get?

A: Iridescent Sharks can grow up to 3 feet in length, so it’s important to have a large enough tank for them to swim around in comfortably.

Q: What should I feed my Iridescent Shark?

A: Iridescent Sharks are omnivores and will eat a variety of foods, including pellets, flakes, frozen or live foods such as shrimp or worms. It’s important to provide a balanced diet to ensure they get all the nutrients they need.

Q: Do Iridescent Sharks need a lot of space?

A: Yes, Iridescent Sharks are active swimmers and need plenty of space to move around. A tank that is at least 100 gallons is recommended for one adult Iridescent Shark.

Q: Can I keep multiple Iridescent Sharks together?

A: Yes, Iridescent Sharks are social fish and can be kept together in groups of three or more. However, it’s important to make sure the tank is large enough to accommodate all of them.

Q: Do Iridescent Sharks need a lot of filtration?

A: Yes, Iridescent Sharks produce a lot of waste and require a strong filtration system to keep the water clean and healthy for them to live in.

Personal Anecdote: I’ve had Iridescent Sharks in my own aquarium for several years now and have found that they are fascinating fish to watch. They are active and playful, and always seem to be on the move. However, I’ve also learned that they require a lot of care and attention to thrive. By following the guidelines for their care, I’ve been able to keep my Iridescent Sharks healthy and happy.

Reference: Wikipedia.


Hi there! My name is Jacob, and I'm the founder of this Pet people blog that talks all about aquarium and fishkeeping. I've been passionate about fish and aquatic life since I was a kid, and I've spent countless hours learning about different species, their habitats, and how to create the perfect environment for them to thrive in.

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