He may be acting strange for the same reason the other one died. Check your water parameters (ammonia, nitrite, nitrates) and you should do a water change to be safe. How long has this tank been set up? Is it cycled? How big is it? How big are the sharks?
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Current setups: 1800 gallon koi pond, 10 gallon planted, 150 gallon reef, other FOWLR tanks
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