Petco Text Logo
Petco Pet Logo
  • Two Easy Ways to Start Earning Rewards!

    rewards header
    Become a member today!
    Members-only pricing and offers, personalized care notifications, Vital Care points back on every purchase and more!
    Petco Pay LogoBecome a credit card member today!

    Earn 2X Pals Rewards points at Petco
    when you use Petco Pay!

    APPLY NOW
    Learn More About Petco Pay Benefits

Why is my new guppy hiding with a limp tail and sitting at the top?

Updated on September 23rd, 2025

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

I bought two guppies a few days ago. The first guppy is acting fine, swimming along with all the others, but this new one is hiding behind the filter, and under the roof of a little hut I have in the tank. Her tail is limp and not fanning out, and she tends to sit at the top of the water. Iv'e checked the symptoms on multiple websites and got many different answers. I've also looked at their tails, and it looks as if both new fish had the very beginnings of fin rot when I bought them. Help????

1 Answer

Most Helpful Answer

Susan England-Foster

Answered By Susan England-Foster

Veterinarian

Published on July 4th, 2017

unfortunately it is really common that fish are sold when they are already sick. I would be concerned the one hiding has a respiratory infection or possible fungal disease like fin rot. You can try and medicate the water with over the counter anti fungals. However I would recommend trying to take them to a fish specialist to get better medications due to having to treat both of them. If one continues to get sicker I would recommend placing it in its own tank.
Vote Icon1Pet Parents found this answer helpful

Smart Picks for Smart Questions

Have A Vet Question?

Book an appointment with the pros – our expert vets are here to help.

Share

Styled arrow button