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My fish filter has white specs. Is it mold or mineral deposits?

Updated On September 23rd, 2025

Pet's info: Fish | Gold Fish

So today I went to feed my fish when i noticed white specs all over the filter where the water dispenses the filtered water back into the water I think it is mold but please help me out here because I am no expert

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Answered By Todd Cecil

Veterinarian

Published on March 16th, 2019

Thanks for reaching out about Corn and including photos. This could be mineral deposits but is difficult to tell in the photos. Mold usually does not grow below the water level as needs oxygen. Clean the filter well. A sample of the material can be acquired and a veterinarian might be able to help by examining under the microscope. Good luck.

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