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Cycling a new fish tank with high nitrites: How often to change water?

Updated On September 23rd, 2025

Pet's info: Fish | Unknown - Fish

Hello i stared a 75 galloon 6 weeks ago nine tertas in there saturday and sunday did small water changes should i do every week or wait until tank is fully cycled? Had high nitrites levels thanks

1 Answer

Most Helpful Answer

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Answered By Dr. Dayna, DVM, CVA

Veterinarian, Certified Veterinary Acupuncturist

Published on June 14th, 2018

If your nitrites are spiking then I. would do a 10% water change weekly until it stabilizes. It sounds like you are testing and doing the right things. I am cycling a tank right now too- it is a little stressful! Best of luck and enjoy it!

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