Deformed growth and curled up edges

Attached are the picks. The plants are growing like crazy in the past 8 days they have just exploded but they seem a little deformed and the edges curl up at a 90 degree angle but the whole leaves are curling up just the edges. There is no browning on the curling or anything.

600w hps
ebb n flow

Am I just being to picky or is something possibly wrong? Not enough water or to little is what I'm thinking or maybe ppm is bad since I don't have a meter.

Do you have a PH meter ? Looks like nute lockout.. You will find it in the plant problems section.

Meters and hydro. Man a good combo meter is worth more to me than a big light. If it is not right PH and PPM the light is no good.

Doesn't look like over nutes because no yellow. They may need more water if the temp is up too high.

its just too hot for them, move the light up further, it will cure in a day.