hey i have a dwc setup and this is the third plant that has fallen victim to this "stem rot" im calling it. in the picture you can see at the base of the stem it appears to be a dark color and in the past it basically gets eaten away after a period of a couple of weeks. what should i do? is this happening because of the dwc setup getting the stem too wet in the past this has led to the plant falling over because of the loss of support. please give some advice