Are platys, guppys and mollys generally not very hardy because all they do is die after a few months and yet all my other fish bala sharks, cardinals, gouramis, angel fish, clown loach, few other types of tetra i have all seem to last and dont kick the pan. I know it isnt my water because all my other fish are sound and have been for ages. I just cant seem to keep guppys and platys. whats everyone one else think.