well as stated above, I have a root problem. it semms that the roots get to 3 to 4 inches long and white as rice, then for some reason they start to turn tan, then brown, then break off and die. what am I doing wrong? the res is covered in reflex insulated tape, and with black duct tape under that. so there is no way that light can get through all that. plus then I also have a windshield sun reflector on top of that. I have even changed my tubbing from clear to black. now, the only thing that I could have done wrong was, that when I changed the res they might have gotten some light on the roots, but not for more than a min at the longest. could this bee what's going on? I ordered physan 20, I hope that this will work out for me, what do you guys think? any ideas are welcome. thanks for listening and your help.