HotRocks
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How big are these spots?
It sounds like it may be velvet? Typically going from nothing to "covered" overnight would be a sign.
No matter what it may be, once you figure out what you are dealing with, you will want to treat all of your fish even if some are asymptomatic.
Can you post pics of the tang?
It sounds like it may be velvet? Typically going from nothing to "covered" overnight would be a sign.
No matter what it may be, once you figure out what you are dealing with, you will want to treat all of your fish even if some are asymptomatic.
Can you post pics of the tang?