If you are talking about the regular blue tang, it is blue with a yellow tail, they are great fish! Very active fish. The only drawback is that they can get ick easier, they are called ick magnets, but if conditions are always kept good, and ick not introduced into the tank, the fish will do good. The 55 or larger is just fine. They don't have any color change though. They stay the same color, but just get big. This is the first fish that got my attention to saltwater fish some 25 years ago. I thought it was so strange that they are almost round when young. I also run a uv on my tank to help with parasites/bacteria.
Go get one.



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