One of my Glowlight tetras has stopped swimming with the shoal and now hangs around by itself. I noticed it has some white stuff on its tail. I'm not sure if it is a fungus or bacterial, and I'm having trouble getting a clear picture. Still, I'm worried that it may spread to the other fish in my tank. Right now I have a Betta tank that is undergoing treatment with Tetracycline - do you think it is a good idea to isolate the tetra and treat it in the Betta tank, just to be safe?
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