top leaves curling

I'm in my 4th day of flowering. They were fine until today. I noticed a few tips of the leaves near the top had curled under a little. Just the tips. A couple of the tips look like they're drying out. I just fed them today. Iknow they will droop a little after watering them. But they never curled under. I did add a little more fert. Just a little more than the last time. Think I added too much? Should I just use water next time. I feed every 4 days. This is the 2nd time with more fert. The first time everything was good.

If it's just the top leaves, my first guess would be that your light is too close...

the drying out on the tips you speak of could be minor nute burn, just lay off a lil bit

The lights are about 2" from the leaves. 3 40W cfls. The lights have never been a problem. The only thing I did different was add more nutes. Maybe a little too much.