i have a 180gallon set-up filtration is 2 fx-5s and 1 xp4 no carbon in any filters water is always crystal clear, my stock consists of 1 azul 3 monos, 2 it dats, 4 frontosas, 5 severums, 4 geos, 1 parrot, and 1 xxl common pleco, all i feed is massivore and freeze dried krill once in a while they may get frozen beef hearts and finally my substrate has always been bare bottom until 2 weeks ago when i decided to use aquarium sand bought from my local lfs..lots of driftwood a few fake plants and a flower pot....the problem is i did my water change of 50% this morning which i do twice a week and today i notice thousands of little white worms floating in my water the fish seem fine no rapid breathing no rubbing on the driftwood all are eating but im very concerned about these little worms EVERYWHERE---should i pull out my old diatom xl filter im baffled on what to do or how to treat this---please help also i test my water every week and all is fine