A couple of my plants are pretty dark green and the tips are curling under. It is a 1000 watt mh bulb. In 3 gallon pots. With miracle grow x2 growth moisture control soil. Used Bonnie's plant food a couple times diluted. A fan blowing over all the plants in the tent. In an attic and it starting to get colder at night, was wondering if this had to do with something. Here are pics of set up and close up.
I don't see any picture, but I do know that dark green leaves and clawing are both symptoms of nitrogen toxicity. I'd lower the amount of N you're giving them. I'm not sure how easy that will be though considering you are using miracle grow.
Droopy one is overwatered. Dark green/clawing is heavy N. MG needs to be cut with perlite as its a bit hot. Let the droopy one go through a dry cycle and purge the medium of the ones suffering from N toxicity, 3x's the volume of the pot, no food for two weeks. Resume feeding at a reduced rate.