I would get some hermit crabs and shrimp to clean up excess waste. I would get some snails to clean up the rocks and glass. Get different kinds of snails. I would really look into what kind of crab would be reef safe for you. Most reefer's think crabs are evil!! I dont have any, besides hermits.
With that size tank, I would get about 100 snails, and about 50 hermits. IMO.
100 snails seems crazy to me. I dont have snails yet, put I was going to get 12 for a 37 gallon tank.
I have about 9 hermits in there right now, I will need more.
Hardware: 37 gallon SW tank and stand by Oceanic Systems, Magnum 350 Pro Canister Filter (half carbon), CPR Bak Pak 2R skimmer, Maxijet 1200 Powerhead, RenaCal 150 W heater, Compact fluorescent lights with moonlights. 40 lbs of liverock, 3" sand bed.
Software:2 Tank-Raised Ocellaris Clowns, 1 Purple Firefish, 1 Electric Orange hermit crab, 18 Blue Legged hermit crabs, 8 or so Nassarius snails, Xenia, Blue, green, and Green Striped Mushrooms.