IMO get rid of ALL of those fish, and get some fish more suitible for a smaller tank (the tang needs a 6 ft tank, triggers can get big and mean, especcialy the huma, and groupers need big tanks)
some fish more suitible for your tank are: dwarf lions, dwarf angels, gobies, blennys, clowns,anthias,cardinals, hawkfish, dottybacks, etc.
Feduke