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Why are my goldfish lethargic at the bottom of the tank but eating?

Updated On September 23rd, 2025

i just got 10 fishes 2 days ago. 4 goldfishes and 6 silvers. the tank is all done. the temperature is constant, filter and pump working well. so 2 of the goldfish just stays at the bottom of the tank and stay there for the whole day. they rarely come up swimming. both are eating their food well tho. the rest 8 fishes are very fine(touchwood). so, the 2 are lethargic and just stays at one corner at the bottom of the tank. water PH is perfect and quality is all fine. and no injury of any type.

1 Answer

Most Helpful Answer

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Answered By Ricardo Fernandez, DVM

Veterinarian, Veterinary Oncology Resident

Published on January 30th, 2019

Thanks for using Petco Pet Education Center, formerly Petcoach! This does not necessarily mean an actual disease or issue. Keep in mind that whenever you have a fish tank, they are going to behave differently and locate themselves in different places in the tank and that does not necessarily mean a problem. If they are eating their food well, they are likely ok. Best of luck!

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