my dad has a 125gal Saltwater Fish-only(slowly becoming FOWLR) with a coral catshark, 2 snowflake moray eels, 1 dog-faced puffer, and 1 domino damselfish; a 45gal Freshwater with tons of uneaten feeder guppies, 2 goldfish i got from a carnival(and amazingly they've been very healthy), 1 pleco, 1 electric blue lobster, 1 elongated bronze corydoras, 1 blackfin corydoras, 3 giant danios, and 1 albino oscar; 1 12gal Hex with a bunch of "saved" feeder guppies.
BTW, your tank is 2 times too small for a tang of ANY kind, and the coral beauty might be a little cramped as well. just wanted to tell u that.