Very limited number of hermits, maybe 10 in my 211G tank.
A number of different snail species including turbos, ceriths and nerites. I like the big turbos but can't seem to keep them alive anymore since I started vodka dosing, I don't seem to grow enough of what they like on the glass. I'm a big believer in serpent stars, I have two in there. I feed a lot of mysis and those guys hunt down any lost mysis shrimp. I find the white pincushion urchins do a good job on some of the shaggier algae that I have. Also grind a lot of coralline off the rocks! I have two of those, one big and one small. They are a lot more energetic than the blue tux urchins, I don't think I would like them in a smaller tank. I have a blood shrimp and a couple of skunk cleaners, don't know if they count.