I have three different springtail cultures (white) that have been producing for a few months. During the last few weeks I have been feeding off of the small culture and haven't bothered the two larger ones. Tonight I opened one of the larger one and noticed that they were no longer white bugs in the culture but brown. They seem to be smaller and round in shape instead of elongated. I guess the question is are they mites or some other bug. There do seem to be some springtails mixed in but not many, would it be best to toss the whole thing?