Leaves Curling!!! What does it mean?!

[raeanm]

Been growing indoors w/ a hydroponic system. Plant will be 15 weeks old soon- and the leaves are beginning to curl down and around themselves- First time grower- so I have no idea if this is good or bad!?! Does this mean I am close to harvest? Is there too much nutrient? Has anyone else had this happen to them? Any advice would be greatly appreciated!!!

[LOC NAR on probation]

Everyone else has had this happen for many reasons.

Pic's would help alot but we need way more info.
There is a trouble shooting form at the top of this section. Please fill it out and pic's if you can.

If I tried to guess it would be a stab in the dark.