Oh cool choices. I have a Randall's goby and he's fun to watch. When it comes to dwarf angels there's a risk that they can eat your coral. I'm not a tang police, but the tangs are very active and need a lot of room to swim. Waiting until the fish outgrows the tank isn't that great imo. 75 is a min. gallon size according to LA. Bluezooaquatics recommends 55 I think. There are many debates and people have different experiences. Some people say that each fish has it's individual tastes. Some say all dwarf angels will eventually nip at corals even if they haven't for years. You have to ask yourself if you're willing to put $100s if not $1000s of coral on the line?