Hey everyone, First off the plants are looking very nice as far as the leaves are concerned...there are slight signs of nute burn but that will be fixed soon. But the problem lies within the stem. The plants are roughly three weeks old and are growing very fast. The stem on a few of the taller ones are looking very week especially at the base of the stem where they are turning brown and look almost on the verge of death...but the leaves are looking strong and healthy as with the roots...sorry for not having any pics but is browning around the base of the stem normal in early developed plants, or is there a major problem here? Also, this is a drip feed hydro grow system under 18/6 flourescent.