I had a mandarin for about six months, he did eat some forzen foods but not enough to sustain him, I endded up giving him to someone who had a 180 gal tank because he was getting thin.
I haev a 10 gal, with a pair of percula clowns and a bicolor blennie. the clowns are very nice, they have big personalities. i had a sixline wrasse in there as well but i move him out this week, he was becoming agressive and ithink he was simply too active for the small tank.
Jaw fish are fun, if you get a semi-outgoing one...I had one untill the bottom of my tank fell through and he was sucked out with the sand, I couldnt find him fast enough to safe him
he was a lot of fun, he would gather shells and build a fortress and get so angry when the shells that had hermits in them crawled away! you do need a deep sandbed for them to burrow in.
Hope you find something cool to stock with :happyfish