What are the dimensions? I would say not really, maybe a small one for a short time but not ideal. Is it a reef tank or folwr, there's lots of dwarf angelfish or wrasses that are brightly colored and active that would be better suited to that tank. Keep in mind also that herbivores like tangs add a huge bioload, they literally poop and eat all day long so any larger fish is going to severly limit the amound of other fish you can get.