Questions for a pro

My plant is abot a month and a half old i flowered 2 weeks ago and they just showed sex 2 days ago. Yesterday i disolved some bonemeal into some water and used that on my plants it was very little bone meal dissolved into alot of water. Anyway Today when i awoke from my slumber i noticed my leaf tips were curling down very slightly but i could still teel the were curling. The bonemeal i like 6/12/0 and im growing in regular potting mix with a small amount of MG potting mix just cause i had to top off the soil. I had my hps about 6 in away from the plant and i though i could be one of the following.
1.Luminem Burn
2.soil ph
3.the bonemeal
Which one do you think it is or possibly something i havent thought of holler back at me