Need help on Leaves curling/turning

Hello all, I got a closet grow going, just recently entered flower, and running into some weird issues. The first and second pic show a plant whos fan leaves are literally turning upsidedown, and the third pic shows a plant whos leaves are curling not from the tips but from the sides. Any ideas/solutions?

Looks like my plant when it got too hot one time. Or lack of nutes. what kinda light is it under?

8 CFL's so i doubt its heat...they didnt really start doing that til i started flowering. I havent fed them proper flower nutes yet (just started flowering a couple days ago) but i think i might do it tonight before the 12 off.

Yeah, feed fer and then see what happens in 4-5 hours