The last pic is a female. Sry not able to go through the thread now, will hopefully do so tomorrow. Are you testing/treating guys for parasites? I also suggest to do full on quarantine for everybody separately until tests are negative and you are sure everybody are ok, eating/pooping. Cover the sides or think of something so they won't see much around, it will minimize their stress levels and help them heal better. It's especially the case with recent imports like yours. Also watch for the nose rubs, if flamazine not helping much, get some systemic antibiotics. I found combination of both is the best, but it's doesn't look too bad to use a heavy stuff yet.