I have noticed little bugs in my brev tank, very small, round, I think with six legs. I see them a LOT when I mist the tank, mostly on the bottom of the tank in the moss, sometimes on the branches, sometimes on the chams ! They don't seem to be living on the chams, just walking around. They aren't springtails, they're quite round, about .5mm or so. Do I need to do something to get rid of them? I would guess they're detrivores, but there seem to be an awful lot of them. I don't think I can get a good pic, they're so small.