Isn't superthrive a root stimulator. Anyways, I wouldn't give them any nutes for about 4 weeks. Probably burning them up. Do you have air flow? Looks wet in there. Could be root rot or stem rot.

They need to dry out in between waterings. Your 86.2 degrees in the pic leads me to think your average temps aren't as low as you say, considering you said you spiked at 85. Don't lie to yourself, fix it. I would say get a fan, exhaust, intake, let them dry out, no superthrive.

I think i may have read somewhere Jiffy isn't good for seedlings.
Lit Up Reviewed by Lit Up on . new grow whuts up everyone so i was down in the valley a couple weeks ago and i got some seeds of whut my cuzin told me were a mix of sunk red hair and white rhino or in other words red rino and here are a few pics of that this one is from the supposed red rino the fron right and back left are the rr the other two are some very crystally bud i got a while back even the seedlings have trichs on them and a close up of the bag seed sorry not such good quality Rating: 5