No Idea why, Leaves curling like claws

Hi.
I have 2 B Farm Blue Cheese Fem Plants. The plants look healthy except for tips curling under like claws and the tips are also darker.
They are in individual Waterfarms with Hydroton hooked up to a 13 Gallon Res/Controller.
I am in day 39 of Veg. with 1200 PPM Nutes.
I am using Flora Gro, Flora Micro, Flora Bloom and Flora Blend.
My Plants are on an 18/6 cycle 10" under a 250 watt Hortilux.
I have a day temp of 75 deg. and a night temp around 65.
I have a fan circulating lightly.
My Ph is kept steady between 6.0 and 6.5

I can not figure out why the tips are curling under. Any help would be appreciated.

I think your ph is high for water culture. Try 5.6-6.0 and see if that helps. Those ph levels (6.-6.5) are for soil.

SomeGuy said:

I think your ph is high for water culture. Try 5.6-6.0 and see if that helps. Those ph levels (6.-6.5) are for soil.

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Thanks, I'll try that out. Lots of conflicting reports on proper Ph for Hydro This is my first Hydro Grow.Im afraid that by trying to fix it, I'll make it worse. What is the general consensus on the right ph for Hydro? I think I read somewhere that Blue Cheese enjoys a lower ph.
Thanks for the help.

hydro is like any other thing its different for each kind of plant as far as weed its 5-6 aim for 5.8, but if you are growing fruit then you are aiming for like 7's or some shit, drop your ph down a bit