@Techne what your observing is more than likely copepods and the bigger ones are amphipods. Its perfectly normal and is good. They eat bacteria and other things in the water column. Certain fish also eat them (wrasses, gobies, blennies, manderin, some file fish) Please by no means go out and get a Manderin, they will eat the entire population within at least a month and then starve to death. THose fish are best left in the ocean or to expert reefers/ aquariums.
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