Fish has white fluffy stuff on gills and eyes as well as what looks like fin rot. We’ve lost almost all the fish in our aquarium… we thought ick initially and have dosed Melafix but it doesn’t seem to be working. They won’t eat, they’re either laying on the ground or floating at the top of the tank gasping ): we have a large tank with several peaceful species and now we’re down to just a handful of fish left. We are devastated.

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Dr. Massimo Orioles, DVM, Cert AVP, MRCVS · Accepted Answer

Hi and thanks for your request. this ''fluffy'' material on the skin fish is likely a oomycetes (a fungus basically) called Saprolegnia. This is a secondary proliferation due to a primary infection which could be due to a variety of causes unfortunately. From the pic white spot disease (ich) dies not seem to be present.
Given the high mortality incidence it is absolutely necessary to check water parameters and make sure they are normal and take the moribund fish (and the dead ones) to your local veterinarian for (euthanasia if needed and) necroscopic examination. Your local veterinarian will be able to tell what is going on or possibly prescribe some treatment (likely antibiotics or disinfectants).

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