06-08-2009, 07:44 PM
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Your tang is a Ctenochaetus genus, same as the Kohl Tang, Chevron Tang, and Tomini Tang. I have a Tomini in my 180, and have kept the Kohl at home in a 55 gallon. Generally, Tang of the same Genus display similar behavior and will not be as aggressive towards other Genus.
This rule of thumb applies very well for larger aquariums, but in a 90 gallon i'm not so sure i'd chance it. The Ctenochaetus are the most passive of all Tangs, and would probably be bullied by any members of the Zebrasoma genus in any aquarium less than 6' in length. This includes the Yellow Tang.
For the record, any of the Acanthurus tangs, including the Paracanthurs Hippo Tang, are out of the question for a tank of your size. They grow way to large to consider in this tank.
I also would not personally add any members of the Centropyge angelfish genus, which are the dwarf angels. I have witnessed many Tang become offended to these fish, as they compete in nature for a common food source, namely algae.