CuC is a hot topic as some reefers will never ever have a snail or crab in their tank while others like me love them in my tank
Blue legged and red legged hermit crabs are great at cleaning up detritus and left over food especially between rocks and crevasses and will eat some types of algae but I've found that is hit and miss
Snails will clean the film on your tank glass and detritus off rocks and sand and some will burrow into it and clean in the sand too but again hit and miss
Downside to having smaller CuC in larger tanks is if you have larger fish they can view your guys as snacks.
Cerith and Astreria snails will propagate themselves haven't had much luck with nassarius procreating though.
All the above are relatively cheap per se and I would try 20 or so hermits and 30 assorted snails and go from there
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 My aquarium is nothing but a smorgasbord for my cats.....
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