We have a fox face in a 100gal & he is very active & loves all the rock crevaces to swim between.
We also have:
4 green chromis
2 Percs
1 Pseudochromis
1 Clown Goby
1 Dragonet
Ours refuses to eat any algae sheets. I feed lots of things, but for the foxface I throw in Formula One (pellet, frozen & flake), Spirulina enriched Mysys & Brine shrimp, Emerald Entree frozen. He eats anything &everything!
We've had him for about 4 months, & he's a happy boy/girl...whatever!