melypr1985
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Is this spread only by way of clownfish? Will my other fish host the disease/ parasite or whatever it is?
yes. Not all fish will be effected by brook, but they can all be carriers to infect new fish and especially clowns. You can wait and see how it progresses, but if it truly is brook then by the time it looks bad enough to be convincing it may be too late to treat it successfully.