I'm not sure what the reason for the curling is. Temp: 72 Ph: Unknown (Waiting for my Ph pen) Water: Distilled Light: 1bulb - 2700k - 23w
I also had some leaf curl on one of my plants, I even had that same plant end up falling over. All I did was plop it against a stick and kept feeding it, eventually new growth came in that was much more happy looking. Oh yes! I was also told to move my light closer, that might be the reason. I'm sure someone more knowledgeable will come along, in the mean time do you have pictures?
Leaves do curl now and then. I would not worry about it. 23 watts of CFLs is inadequate to support a plant btw.