Most critters in a clean up crew won't devour detritus; instead eating leftover fish food or algae. Most detrivores live within the sandbed, so would not be introduced into a bare bottom reef. These include peanut worms, spaghetti worms, pods, bristleworms. Cerith snails are the only shelled animal I can think of that is a detrivore, but they also need a sandbed. With a barebottom tank your best plan of attack is to use powerheads close to the bottom of the tank so that detritus is not able to settle in the tank and is instead flushed to the sump where mechanical filters such as filter pads, filter socks, and/or a protein skimmer can remove it.
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~ Mindy
SPS fanatic.
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