what WHAAAAAT!
Well there's your problem... your plant can't use the nutes, water, or light because atmospheric CO2 is the limiting factor. They are suffocating, and that contributes to the curly leaves.
Very important concept in science, particularly as it applies to chemical reactions, which is what photosynthesis is. You run out of CO2, the reaction CEASES. This means your plant stops growing entirely.
REad up:

Limiting reagent - Wikipedia, the free encyclopedia
stinkyattic Reviewed by stinkyattic on . Nutrient Burn or Defeciency? Here is the problems I'm having. The plant was doing fine at first, except the top leaves were yellowing and drooping. I thought this was because of the lamps causing them to burn since the bottom new growth was getting very bushy and a nice green as in the pics. I raised the lamps, but now I noticed the bottom leaves are starting to get yellow at the tips. Any advice or help would be great. Here is my information: It's Indoor, I've been keeping it in Veg now for about 3-4 months on Rating: 5