It will get a short burst of energy and swim around frantically for a few seconds and then it will lay back at the bottom… ... My Fantail Goldfish Is Laying on the Bottom on his Tank… You don’t. I have to say that my Iridescent is very laid back and likes to hide on the bottom of the tank most of the time. The Iridescent Shark Pangasianodon hypophthalmus (previously Pangasius hypophthalmus) is a very active catfish. Iridescent Shark prefers living in warm water, so arrange a heater for its tank. Today I’m gonna go over the top 10 fish you should never buy for your Aquarium and why you shouldn’t buy them. As juveniles they are timid and will spend large periods of their time hiding. Schools require even larger tanks. Temperature. I just added a Tinfoil Barb, a Bala Shark as well as 2 Platy fish. The temperature of the water in the tank of Iridescent Shark should be 72-79 °F (22.22-26.11°C). A juveniles iridescent shark will need at least a 100 gallon aquarium. Iridescent sharks require a minimum tank size of 12 m (39 ft) to develop naturally. Favorite Answer. If your goldfish is swimming sideways or upside-down, it may have swim bladder disorder. As adults they will need a 300 gallon tank. I have a 20g tank and just got 2 about 3in long. It wil... reply #9. Constipation, enlarged organs, or infection can all cause the swim bladder to stop functioning properly. What size tank do you keep a four-foot fish in? Fish this ridiculously large have no place in the aquarium trade. These injuries may result in the fish sinking to the bottom, where it may lie on its side or back until it recovers. Lv 7. how do you tell the difference between a male and female iridescent shark in short how do you sex them ? why is my arowana laying at the bottom of the tank, it seems lethargic plus it's mouth isn't closed all the way. Moreover, maintain the parameter of the water of this fish by checking the temperature, hardness and pH level. The Rainbow Shark is a territorial fish which can cause certain behavioral problems such as aggression and dominance. Temperature. I have a tank with a Iridescent shark, angel fish, and two sil... My rainbow shark and bala shark are swimming at the top of the tank gasping... My iridescent shark is laying on its side at the bottom of the tank. The name is derived from its juvenile coloring, a silvery iridescence with a couple dark stripes, and a body shape resembling that of a shark. If you’ve got a custom tank over 1,000 gallons then this list probably isn’t for you but if you think your 55 gallon tank can hold every fish under the sun, keep reading because it can’t. 3 Answers. Iridescent shark has very poor eyesight, it is a very nervous fish easily scared. hi, i have recently got 2 iridescent sharks (catfish) thay are only about 2 inches long. Don’t knock on the tank glass, the fish may hurt itself while its crazy panic attack. Answer Save. In this guide, we cover everything you need to know about iridescent shark care. i have noticed that one of them is a bit pale, it has went from a nice black colour to a grayish white.