I need help i think. I have about maybe thirty mollies that vary in size small kids to young adult size. As well as 2 yoyo loaches for snail cleanup, and a red tailed albino shark in a 55g tank. I don't have test kits atm but I have checked it enough in the past to assure myself the parameters are probably not the issue here (at least the three evils ammonia, nitrate, nitrite are always fine). I have had this tank set up for almost three years and literally hundreds of mollies have been born and grown in it with fairly little issues. Particularly never once have I had a missing eye in a molly. I haven't had the loaches for that long and since then i've had three of them missing an eye. The empty socket looks pristine in all the cases, the eye is just gone the mostly white marble mollies show no redness or torn areas around it the eye is just gone it seems. could the loaches be doing this or maybe the red tailed shark as she is also a fairly new addition? please help if possible ty.