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