my tops are starting to turn a dark/green and is like britle is it bugs, soil need help... http://img112.imageshack.us/my.php?image=weed21wu.jpg
First thing you need to check is the PH of the soil. It should read between 6.3-6.8 or so. I am wondering if you have root rot. It looks like a plant I once saw that had some root rot. I could be wrong though. Please give us more details on the grow.