Dwarf angels do best when added to well established tanks. A year might be stretching it, and 5-6 months seems to be more the norm. You mentioned that you have corals, so in a reef setting, angels are a gamble. Coral Beauties are supposedly one of the more "reef safe" species, however they can munch on corals so you need to factor this in to your decision. $20.oo is a good price for a healthy specimen and they are great fish. I have one in one of my tanks. I'd say your tank is mature enough, but just keep in mind that there are no guarantees with regards to what he'll go after in the tank. What size tank by the way?
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