If that's just a tray and there sitting in water there drowning...

Rapid Rooters have a great oxygen to water ratio but if there sitting in stagnant water that's lost and they become water logged, no oxygen no roots...

Damp and not soggy is the key...

Also keep the light a good distance from the clones, like 18" to 24" away

Lots of Great Cloning Threads on this site, worth the read...

One simple way, as they can take oxygen from the water as well...

Take a 8"x16"x6" plastic tub from home depot...

Place a 12" air stone on the bottom, fill with perlite and PHed water...

Cut, trim, dip and place clones in perlite, 7 to 10 days later you have roots...

Good idea to mist the clones for the first two days...

Hope that Helps...:smokin:
ZZTops Reviewed by ZZTops on . Clones turning yellow Hi. I got a batch of clones, roughly 11 days old. Using a fluorescent 100w about 10-12'' above the dome. Temp roughly 60-70deg any help would be greatly appreciated... Thanks Rating: 5