So I recently changed my tank over to rcs as many of you here have probably seen. They seemed to be doing really well but over the past two weeks Ive lost 3 of them for some unknown reason. I routinely check parameters and everything is always at zero except for nitrate which is rarely a couple ppm. The other weird thing is it has all been males from what I can tell (they are a very very pale red). I even have a couple tiny juvies in there doing great. Any ideas?