I'm about 3 weeks into a fallow period and the critters are having a blast breeding with no predators, or I'm just noticing more of them because I don't have any fish to look at. Either way, are these things pods of some sort? I happened to catch them this morning pinned between the glass and a snail. The snail is about the diameter of a nickel for size reference. They look kinda like tiny prawn shrimp.