Ok I think most of the curling has gone away. My two oldest plants are about 9" @ 3 weeks, and the other two are about 4" @ 2 weeks. Most places I look says I should wait until they are about 12" before starting the flowering stage, but the problem I'm having now is the temperature and humidity. If you can see in the picture it's like 105 F, and 20%. I have a cup of water directly under the light, and a fan that blows out of the closet. Any suggestions how I can fix this???