Depends on what kind of detritus you have, and what fish are in your tank. A variety of shrimp and snails will be compatible with most community fish, while IMO crayfish and most crabs are not good in the average aquarium. Many of the aquatic crags need to be able to get out of the water, and will die if not able to do so. They are also expert escape artists, so a tightly covered tank is a requirement. Crayfish are destructive--they will snag sleeping or long finned fish, mow through plants, and knock over rocks.
Amano and ghost shrimp are good cleaners, nipping up extra food and algae. They will pick through waste for undigested food, but they do not eat the waste.