I keep a 100 g. And right now my fishy complement is all about that size, with fairly massive rock work, lacey rock and full of holes. The key component is a fairly dimwitted blue chromis, first to come out after anything scary, and the rest figure if a shark hasn't eaten him, it must be safe. The YWG has taken a few months to become cheekily confident. The gramma and the clowns are fairly full of curiosity, ditto the little blenny. None of them bother corals, and generally the whole lot each have their hideyholes for the night, and are out and about the rockwoirk at the crack of dawn. This is true of most fishes that max at 2": you get a slice of reef that's active, nobody is big enough to threaten anybody else, and in the real reef 'out there' the little reef dwellers don't venture very far from their hideyholes in the first place. So you have a nice slice of reef where corals can thrive and the little guys are out and about something all day long. If you want low drama and little trouble with a tank, this is not a bad setup.
