i have here some white widows they are 27 days old from seed. they seem ok healthy but the lower leaves on one is turning yellow and brown spots....and the lower stem looks unhealthy.. i used the flood method and run it 1 time a day for 30 minutes and put dynagrow 7-9-5 in it..not sure what is wrong with it...but they seem to be growing pretty good.. besides that and some droopy leaves oh and why is the rockwell cubes turning white?