Looks like ich and either a bacterial infection or uronema, maybe both.
How long have all the fish been together and is this the only one that is showing symptoms? How fast have the dots progressed? Is the wound healing?
Uronema
Uronema marinum (updated 6-10-2023) What You Need To Know: * These are the red sores most often seen on chromis damsels & anthias. However, Uronema can technically infect any fish - sometimes only in the gills. * The most up-to-date treatment methods are being discussed here: Intermediate -...
humble.fish
Marine Ich
Marine Ich (Cryptocaryon irritans) - Updated 6-9-2023 What You Need To Know: * Fish parasite which is sometimes managed in a DT by utilizing a UV Sterilizer, Ozone, Diatom Filter, Oxydator, herbal remedies, enhanced nutrition, etc. etc. * Can be treated in a quarantine tank by using...
humble.fish
Bacterial Infections
Why fish get bacterial infections (updated 6-9-2023) What You Need To Know: * Harmful bacteria are likely ever-present in most aquariums. However, a fish's strong natural immune system + excellent water quality will usually keep it at bay. * Infections can be caused by either Gram‐positive or...
humble.fish
How long have all the fish been together and is this the only one that is showing symptoms? How fast have the dots progressed? Is the wound healing?