Yea Im really new to this so im definately no expert, But I see his leaves arent reaching upward toward the light, instead they are curling down towards the dirt... Ive never grown, just been thinking and reading, but I figure you could think of the leaf as a balloon, when its full(of water) itll stand erect, when its not full itll droop(actually works if you think of it like a penis now that i think of it). for some reason his leaves arent totally full with water. I wouldnt assume overwatering is the cause. Could be low RH drying the leaves. Could be high temps drying the leaves. Could be not enough water in the soil for the roots to suck in, or it also could be that he has overwatered, thus oxygen starving the roots and they cant pump that water up to the plant. any experts know if what im thinking is accurate? Id like to clarify this for myself as well. I also have a seedling just a bit younger than that one and leaves are mildly drooping in the same manner, but having a hard time getting all the environmental factors under control still so im hoping I can fix this.