I won't recommend amount..but here is what the cleanup may consume.
Tongan and smaller Nassarius(stirs the sandbed,detrius,fishfood,anything that dies)
Astraea,Trochus Snails(diatoms,brown algae)
Mexican Turbo snails(hair algae)
Fighting and Queen Conch,Bubble Bee Snails(algae,scavengers)
Emerald Crabs(algae...warning:when they get larger they become aggressive,maybe going after a small fish.)
Cerith snails(stirs the sandbed,scavenger,algae)
There are prolly more but my mind is going blank.I've grown to hate hermits because they become aggressive also,not to mention they may kill snails for there shells.The only ones I could recommend is the Dwarf Blue Legged ones.I have these shrimps;Fire,Skunk Cleaner,Sexy Anemone, and Peppermint shrimps...all seem peaceful and make excellent scavengers.The Coral Banded Shrimp is to much of an opportunist,so I can't recommend that one.There are also Brittle and Serpent Stars,but I never keep any,maybe to soon for them.
Liveaquaria.com has a list of cleaners and there function...good luck.