I haven't added any nutes to the soil yet. No heat problems, no humidity problems, I did see a couple of gnats 2 weeks ago, but I haven't seen anymore, no other pests, the waters ph is fine. Here are a couple pics. They just got watered not that long ago, so they are looking a little droopy.
The lights aren't as low as they look in the pics. The lights are about 2-3 inches above the plant tops, depending on the plant.
Edit: It isn't over water. I wait until the leafs all droop a little and the pot is light before I add any water, then I add enough water that it starts to drain out the bottom. They are currently in 3gal pots. Plenty of perlite in the soil (the soil is a mixture of MG Organics and Sta-Green Moisture Max)
I know people are going to say it has to do with the MG soil, but I know it doesn't. The MG soil was only added recently and they actually started growing better once I added the MG.