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Glofish shark has long, stringy white poop. What should I do?

Updated On September 23rd, 2025

Pet's info: Fish | Tropical Fish

My new glofish shark has long, white, stringy poop hanging off its body. I may have overfed him his glofish flakes. Is he constipated or stressed from being in a new tank? I treated the water with Aqua SafeStart and EasyBalance. What can I do to get him to poop?

1 Answer

Most Helpful Answer

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Answered By Angel Alvarado, LVT

Licensed Veterinary Technician

Published on January 11th, 2019

He may have internal parasites. maintain pristine water quality and confirm stable water chemistry. This can be done by using a home test kit or by submitting a water sample for testing. The local Petco may do this for free or for a small fee. Perform a partial water change, no more than 30% total volume at a time, if indicated. use only conditioned water that is temperature matched to prevent further stress or shock. Check the water temperature as well, since low temps can affect activity, appetite and digestion in fish. Anywhere between 72 F and 80 F is acceptable. Keeping it at the higher end may aid in digestion and defecation. Consider a broad spectrum parasite medication. You can find one in the Aquarium section at the local Petco. Follow label directions carefully and remove the carbon filter insert during treatment if indicated.

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