Are they already rooted or are you in that stage now? If trying to get roots the MH light might be a touch much atm. The yellowing could be the clones feeding off of themselves. I would cut back on how often the rockwool is being watered, mist the clones and put a dome on them. If you dont cut back on the rockwool being watered and dome them the rockwool will stay way to wet and rooting will either take forever or worst case they perish from to much water. I just went through this on my last grow and I'm glad I caught it in time but slowed down the whole process by about a week and a half.
tinytoon Reviewed by tinytoon on . Leaf Drooping Question Hey Guys, New grower here. Here's the 411 on my system and stats.... System: Bubbleponic Medium: 2' Rockwool cubes (too big! was hoping my clones came in 1" cubes since the 2" cubes almost fill my plastic bubbleponic baskets) on top of a 1/2" bed of Hydroton balls with a few balls around the top edges. (i tried to trim the 2" rockwool cubes edges to fit my baskets better) Light: 600w Mercury Hallide with Daystar Hyrdo Farm reflector Vent: Squirrel fan at botton for blowing, 4" In take Rating: 5