My dwarf angels have a definite pecking order, and our constantly after each other. I occasionally see small pieces of tail missing, but nothing major. I've had all 3 together for about 2 years now. If you are going to add another dwarf angel, I would recommend getting a bigger one, not smaller. As for your size of tank, I used to have all 3 in a 33 gallon with no problems. The only thing to watch out for is sometimes they will go after corals or clams. Mine killed 2 clams, and refuse to let my colt coral come to full extension. They have never killed a coral though.
Ryan
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