umm given your size tank which is identical to mine
, id say a foxface would be a great addition, they are hardy and well compatible with most fish, i take it you are new to aquaria? if so stay away from dwarf angels for the time being, unless you have a bunch of live rock in there, id say minimum of 75lbs, more like 90 to be truly effective. and have prisitne water peramters, also maybe a firefish or two, depending on your goal of fish to keep, you could probably get away with putting in a smaller trigger, but a lot of them need a lil bit bigger tank but they will be ok... heres my foxface and percula!! and another of my foxface