I feel really stupid asking this, but do platies eat plants? I have had my platies with amazon swords and e. macrophyllus for many months with no problem, then I bought an H. corymbosa and I noticed after a day that a couple of leaves of so had a chunk bitten out of them. I suppose it could have been snails, but far as I know, I don't have any in my tank. Only other inhabitants are guppies and shrimps...