In my 29G mixed reef, I have 1 emeral crab, 1 sally lightfoot, a couple of scarlet hermits, probably a dozen or more astreas, cerith, nassarius snails....a bunch of mini florida ceriths
I did not get all of them all at once, and I wouldn't advize you to either.....after your cycle, start out with a few of each of the snails.....add gradually after that, like your first fish, then maybe a few more cuc....etc etc