Regal/hippo tangs

Lots of factors. Tanks size, size of the fish, and the fish itself. I've seen things mix that in theory should and things that in theory should not.
 
800 gallons 3-4 inch fish very peaceful fish sump


Royal gramma
Sailfin tang
Pair of common occealris clownfish
Firefish
Yellow coris wrasse
Hippo tang
 
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