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Why is my betta fish not eating, lying on its side, and breathing fast?

Updated On September 23rd, 2025

Pet's info: Fish | Unknown - Fish | Male | 5 lbs

My male beta fish hasn't eaten in about 10 days. He sits at the bottom of his tank and doesnt move unless i move the plant in his tank. There is a heater in his tank that regulates the water, and he has more than enough tank space. I recently did a 1/3 water change because he wasn't eating and his food was piling up. I've had him for a few months and this has never happened before.Has colour fading/ no signs of bloating. He is laying on his side and appears to be hyperventilating.

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1 Answer

Most Helpful Answer

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Answered By Daniel Fonza, DVM

Veterinarian

Published on August 9th, 2017

Hello and thank you for your post! Have you had your water checked recently? I would pick up a water test kit for aquariums. You can find these at most pet stores and see if there is any chemical imbalance that may be causing these signs. He could also be sick so you might consider taking him to an exotic veterinarian to have him looked at. I hope this helps guide you in the right direction!

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