Mag deficiency? Or idk please Help new grower here trying to learn only my 2nd grow

I've had similar issues with clawing & sad looking plants. I was both over-watering & the temperatures at night we're getting a little too low -- combining both of those mistakes together was making it even colder for the plants, especially at night.

I see your fabric pots laying on their belly in the tray. Get yourself some pot elevators so there’s good airflow under the pot and it prevents the pot from sitting in its own pee. Nobody wants to stew in their pee. Search up for some GoPro NX pot elevators. Don’t look at them on Amazon they’re expensive there. You should be able to find them for 5-7 dollars each. Don’t pay more than that for one.

It’s normal for plants that are starting to flower to change a lighter hue of green at bud sites. Don’t freak out and just keep doing what you’re doing. It’s gonna be fine. Just maintain your environment and proper fees/water schedule.

Id say thats over feeding, id give them a little flush and let them dry out, they will soon bounce back, good luck

They look dry and needing some magnesium.