What does it mean if its doing that? I just pH up the plants soil since it was too acidic. The leaves are standing straight up like they're about to close u.
Not sure about your particular issue, but this happened to some seedlings I had a few weeks ago. I never really figured out what the cause was, but I think it was either overwatering or underwatering. I kept those seedlings uncovered (low humidity) and watered them 3 times a day. The next round of seedlings I put under a dome and I didn't water them for 4 days and they did wonderful. This is obviously because of the residual moisture provided by the condensation from the dome. If these are still too small for nutes and your environment is good, I would say check you watering. I pretty positive that's what caused mine to close up over the top. After a few days of the leaves being closed, they started falling over so I got rid of them and cracked new seeds. Hope that helps, sorry I can't give more advice.