Lentic cave habitats are almost always heterotrophic habitats where there are food and oxygen input from the surface. This hydrological exchange seems to be the key factor shaping most groundwater communities. Litter processing in cave water environments has not been experimentally studied as much as it has in lotic subterranean systems. although detritus is likely a critical resource... https://www.bekindtopets.com/amazing-find-ChewMax-Chicken-Feet-top-grab/