Tang

Commonly known as a Surgeonfish plays a big part in your tank adding not only  invariable color but also variety of benefits. They mostly play a big role in algae eating and their maximum size in length usually does not grow past 20 inches. When introducing more than one Tangs, it is recommended to add different genera and size tangs at the same time in a large sized tank to avoid aggression. It is important to note that just because some tangs are known to be docile, each fish has their own quirks and personalities in different aquariums which will effect their reactions.