The first plant is doing excellent, but randomly has one leaf that has what I can only describe as crocodile skin...it feels rough and dry with yellow, see photo. New growth is great and its growing very very fast so I'm not too worried, just more intrigued as to what has done this to the leaf. My second plant has been through the wars, its had light burn and nute burn. But now has this one random yellow leaf. Can anybody tell me what this is all about? Thanks in advance ps. Both plants have been fed once with Eco Thrive Charge