Nassarius, and Turbos is my choice. I dont like crabs tho!
The Nasarrius will eat the detritus on your sandbed, and any food that settles, and the turbos will take care of your aglae.
Id say 2 nasarrius per gallon (420), and 1 turbo per gallon (210). keep in mind that thats a range though, and depending on your stock and parameters you might use more or less.
... I made the mistake of purchasing to many turbos, nassarius, and hermits for my 210. They had the tank clean in a week. Needless to say I'm down to 8 Mexican Turbos(from 30), 4 Nassarius(from 20), 1 olive, 2 conch(from 4), about 50 small blue hermits(from 150), 3 large reds.
They turned on each other. I'd find the Nassarius Snails eating the turbos. Blue Hermits wearring the Nassarius shells and the reds hermits bulldozing everyone & everything. If I had to do it over, I'd only buy a hand full to start out. Would have saved me some money and regret.
The blue legs were the culprits here... trust me, they started it all. You stocked them almost 5 to 1, and they are vicious little buggers!
I'd say go with a mix of turbos, nerites, and ceriths NOW, then add Nassarius Vibex AFTER you get some fish. Nassarius Vibex are detritus eaters, not algae grazers, so they'll do you no good till you have fish waste to clean up. Be careful you dont pick up the imposters, Nassarius Ilyanassa instead (they are NOT reef safe). See: http://reefkeeping.com/issues/2006-11/mg/index.php
So would anyone recommend not using hermits at all? Just snails and other c.u.c.?
I bought a zoa frag plug that had a fair amount of hair algae on it.... brought it home and that evening I saw 7 blue legged hermits working away at the algae.. in the morning it was as clean as a whistle!
So I'm making a switch to get rid of my hermits. I have a 65 with no grazing fish (yet) what is a good cuc? And qty of each crew member?