June6.DIEFFENBACHIA----"COMPACTA"

i love this plant. I have one that keeps getting yellow leaves. I am not sure what I may be doing wrong. it gets enough water. maybe I am watering it too much? It was in a pot too deep and i took soil out to make the roots closer to the bottom and not so much dirt. alas....its still holding on and have lots of leaves...but not like it was when first brought! any ideas please let me know! email me care details! :( chokolatedove81@yahoo.com