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Tang, Angel, and Wrasse Nerd!
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My Tank Thread
I’ve seen this behavior before, yes. Especially in tangs.This might sound nutty, but is it possible for a fish to have a heart attack, stroke, or similar issue? This wouldn't be the first time I've heard of perfectly healthy-appearing fish suddenly dashing about and just ... dying.
There might not have been one single thing you could have done, Chrizzolla.
~Bruce