very subjective question since having a cleanup crew in the ifrst place is highly debatable!
Here are my specs. to start you off:
1. 1000g display, 1,200g total volume
2. Almost BB with a little bit of sand for aesthetic reasons in viewable areas; 400 lbs. sand in RDSB.
3. Refugium
Inverts:
50+ cerith
6 mythrax
48 large Turbos, probably Mexican but not sure
7 blue leg hermits from MI
8 - 12 hermits
approx. 75 adult nerites
approx. 200 sub adult and adult collumbelids
approx. 1000 baby collumbelids
approx. 30 sub adult and adult DIBS Turbo sp.
approx. 3000 baby DIBS Turbo sp.
approx. 200 stomatella (adults and babies)
1 hairy pincushion urchin
1 sea hare
misc. mini brittles, bristle worms etc.
So some notes: I am not a fan of any type of crab but they are so damn cute!
I just put the picushion into the overflow to help keep the coraline alga down.
The sea hare is totally kick-*** but they do have drawbacks like running out of food, and in the evnt of a death, they are toxic.
The list is rediculous in that I really have no idea how many snails are in my system but the fact is they are multiplying like rabbits. Some are part of the DIBS project (Disirable Invertabrates Breeder Society) which I am participating in. The function of this group is to propagate inverts that are better candidates for captive tanks than what you often see in stores.
HTH!