My culture is finally booming for sure... yay! I can see them crawling and hopping all over. So I have been adding them to my viv once in a while. I am, however, still seeing this brown stuff around the culture every day. I wipe it up each day, but it's always back the next. I have inspected the tissue each time and never see anything moving, but I am not ruling out some sort of mite thing. I just don't know what else it could be?! It hasn't seemed to harm my culture, and my fly cultures are still clear looking on the containers that I can see and the brown stuff is never around those. Any thoughts?