The best detritus eaters for reef tanks are various types of snails such as Nassarius snails, Cerith snails and even shrimp like cleaner shrimp and peppermint shrimp.
Hermit crabs, sea cucumbers, sea stars and brittle stars are also good detritus eaters for reef tanks as they help to churn the sand bed and consume waste.
The sand sifting type of sea stars are the best detritus for reef tanks.
Other good detritus eaters for reef tanks are Turbo snails, Astrae, snails, Urchins, sand sifting starfish, Trochus snails, Mithraculus sculptus, Nerite snails, Blue leg hermit crab, bumblebee snails, strombus alataus, sea hares, red leg hermit crabs, tangs, banded coral shrimp, fire shrimp, foxface rabbitfish, Margarita snail and Mithrax crabs are all good for reef tanks.
Amphipods are also great scavengers and will eat detritus and waste.
And emerald crabs are also good for reef tanks as detritus eaters.
Saltwater snails like Trochus, Cerith, Nassarius, Astraea, Turbo, and Fighting Conch are used for cleaning algae, detritus, and sand in reef tanks.