Rather sudden, my favourite wrasse has trouble swimming in a coordinated fashion. He tends to be taken more often by the flow and is often tilted 45 degree sideways. Also, tail tends to droop more than normal. Moreover, stopped eating almost entirely. He approaches food but doesn't take it. I know this is all rather subtle and hard to explain so here is a video on YouTube:
Perhaps @Jay Hemdal can weigh in?
Perhaps @Jay Hemdal can weigh in?
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