Problem with the babies

Got a quick question folks.
I've been taking cuttings for a while now and never had any problems. This last batch is wanting to be hard-headed though.
Basic info:
cuttings were taken from mature mothers
they're in rockwool cubes sitting in a bed of perilite
used clonex rooting gel
temps stay around 80, dome stays moist on the inside.
For some reason the leaves are wanting to curl up, never had that problem before.
Any advice or insight is appreciated.

kinda looks like a heat burn to me, but i could be wrong. has it started to root yet? it could also be a nutes prob but im wouldnt know which one

TheWaffleKing said:

kinda looks like a heat burn to me, but i could be wrong. has it started to root yet? it could also be a nutes prob but im wouldnt know which one

Click to expand...

A cpl of them have started to pop roots. I ph'd the water I soaked cubes in and set ppm at 200. That's the same method I've always used and worked great.
They're under a 100w equiv cfl, over them with a heat mat under dome. The temp at the bottom of cubes is 75.

No other ideas?

Found this hydro, not sure if it's much help.or not though..

http://www.420magazine.com/forums/problems-pests-disease-control/77134-leaves-curling-up-mg-defeciency-input-needed.html

Thanx bro.
From what I read, I may need to open the vents on dome a lil more. Sounds like too much moisture.
Thanx again racer.

I don't use a dome myself unless I've popped new beans and even then it is only on until they break ground (2-3 days max). I don't think the vents in those domes allow enough fresh air in for that many leaves to respiration for a flat of clones and that's all an non rooted clone has working at that point . Instead I'll use a humidifier if needed. Do you spray your cuttings with h2o? I do and when the leaves are wet you have to be careful the water doesn't magnify the light and burn the leaves. I generally raise the light until they dry off. If I'm in a rush I have a small oscillating fan I put on them to speed it up. The moisture on the leaves aids in respiration especially at that crucial time. Make sure it's plain water nothing added - to easy to harm the fresh cutting.

To me it sounds like a heat issue, but I can't be too sure.

looks like you need some air exchange. mix of heat and co2. Had a clone do something similar once when i didnt poke a whole over the ziplock back around a solo cup.

Cool, thanx folks. I changed the dome around to where they'll get more air circulation and seems to have taken care of problem.
Thanx again for the replies everyone.