Got home from work today and flipped up the front hatch of the 29 gallon BioCube to feed the crew. Looked down and saw this on the ledge ABOVE the waterline. Looks like a couple food flake crumbs had landed on the ledge from a previous feeding and these little guys were dining on them. Any idea what they are? Should I wipe them off the ledge and get them outta there or splash them into the tank for the other inhabitants to eat?