I would say the tank is too small longterm, itd probably be alright for a bit. Once its starts getting bigger though, youd have to sell it or upgrade to a bigger tank(Not always a bad thing lol)
THAT SIZE TANK WOULD BE A PRISON FOR A CORAL BEAUTY!! Figured I'd beat everyone to it. But seriously it would be fine but almost all angels run the potential of nipping corals so figure out what kind of corals u want in there and see if they are compatible. Potters and flame angels are also other beautiful options of a dwarf angel.