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What's this bug in my fish tank? How do I identify and treat it?

Updated On September 23rd, 2025

There’s something in my fish tank, but I have no idea what it is and I need help identifying it. Thank you!

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1 Answer

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Answered By Angel Alvarado, LVT

Licensed Veterinary Technician

Published on November 30th, 2018

It looks like a fish louse. They aren't actual lice, but tiny little crustaceans. You'll need to treat the entire tank. These little buggers can be introduced to your tank on new fish or live plants. Microbe-Lift Fish Lice & Anchor Worm treatment is the recommended treatment of choice. Follow label directions carefully.

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