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Why is my new betta fish at tank bottom, inactive, with clamped fins?

Updated On September 23rd, 2025

Pet's info: Fish | Unknown - Fish | Female | unspayed | 0.001 lbs

My betta fish is lying at the bottom of her quarantine tank. Her fins are clamped. She eats and moves but it not very lively. I just got her. She doesn't have stress stripes. Her quarantine is heated and I don't have a filter up and running yet. I was going to add her to a sorority with some other females that were in the cup next to hers in the pet store.

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1 Answer

Most Helpful Answer

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Answered By Angel Alvarado, LVT

Licensed Veterinary Technician

Published on August 17th, 2017

The stress of the move may be the cause. Of course illness, injury or parasites are also possibilities. Confirm proper water temp, 78-80 F is best. Check chemistry as well. Ammonia or nitrites are toxic. Set up filtration as soon as you can or perform partial water changes using aged or conditioned water that is temperature matched. Drop the water level to make it easier for her to surface until she acclimates and is more active.

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