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Heater failed! How to keep my new tropical fish warm in its bag?

Updated On September 23rd, 2025

hello, i have a tropical fish and the heart didnt work for the tank how do i keep my fish warm its still in bag

1 Answer

Most Helpful Answer

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Answered By Angel Alvarado, LVT

Licensed Veterinary Technician

Published on October 13th, 2017

You can float it in some warm tap water but it will need to come out of the bag before oxygen levels drop and waste levels rise. Hot water bottles or a light over the tank may also keep temps out of dangerous ranges until you replace the heater. Buy two and keep a spare ready just in case.

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