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Hi @Jay Hemdal , thank you for responding. In the tank are two clowns, only one showing/showed signs, one firefish without sign. The clowns have been in the tank for 8 months and the firefish for about 4 months. The clown that was showing sign was breathing heavy and not eating, along with erratic swimming. I treated with Rapid Fish Quarantine which contains formalin last night in a hospital tank and today the fish looks much better. Thoughts?Brooklynella usually only shows up in newly acquired clownfish. This does look like Brook, but in its early stages it can be tough to visually ID from a photo. Is the fish breathing hard or rapidly? Any other fish in the tank? Is it still eating ok?
Jay
Thank you so much for the detailed response. I am ordering what you have recommended.I believe Brook here also. Most similar symptomatically to Oodinum, this is also a parasite that primarily attacks the gills first. At the onset, fish may scrape up against objects, rapid respiration develops, and fish often gasp for air at the surface as the gills become clogged with mucus. Very quickly the fish becomes lethargic, refuse to eat, and its colors will fade. The most noticeable difference that sets Brooklynella apart from Oodinium is the heavy amount of slime that is produced by a fish that has contracted this parasite. As the disease progresses, a thick whitish mucus covers the body. This will usually start at the head and spread outward across the entire body.
Hopefully this does not develop into secondary bacteria issue. Typically a standard formalin solution is mixed with either fresh or saltwater in a separate treatment container. Initially, all fish are given a quick dip in the formalin at a higher concentration, followed by continued treatment in a prolonged bath of formalin at a lower concentration in a quarantine tank (QT). Of course, the longer the fish are exposed to the formalin treatment, the more effective it will be at eliminating this disease. I prefer API Quick Cure which is Formalin based or Ruby Rally Pro, with Quick Cure more effective.
If a formalin solution is not available for immediate use, temporary relief may be provided by giving fish a FW dip or bath being the same temperature as the tank. Even though this treatment will not cure the disease, it can help to remove some of the parasites, as well as reduce the amount of mucus in the gills to assist with respiration problems.

