The long and the short of it is that they will eat the stuff that you really don't want hanging around your tank anyhow. They provide a source of food to certain fish and some corals and are extremely beneficial. I am setting up a 75 gallon refugium specifically for them (and worms, and decapods, and copepods and... well, all of the critters that I love.) Be happy they are there (the major thing that you don't want that is small and white are flatworms... just do a google image search.) The populations of pods will wax and wane depending on available food.
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