eat trash
Detritivors
A detritivore is a decomposer (it generally consumes waste products)
These organisms reduce dead plants and animals to their component compounds. Without them, the world would soon be buried in the remains of formerly living things.
Most species are generalist predators, eating mollusks such as clams, oysters, some snails, or any other animal too slow to evade the attack (e.g. other echinoderms, or dying fish). Some species are detritivors, eating decomposed animal and plant material or organic films attached to substrate. Others may consume coral polyps (the best-known example for this is the infamous Crown-of-thorns starfish), sponges or even suspended particles and plankton (such as sea stars of the Order Brisingida). Info location (wikipedia)