Some opinions please

First time grower-I've ghot a hindu kush with some curling- using a HPS 400 watt with constant fresh air and fan blowing. Watering every two days or so- as needed- dry climate- NorCal- using FoxFarm grow big when watering in a 1 teaspoon per 1-1/2 gal water- Is it normal to see some curling- or is she drying out- The green dragon next to her is doing fine- Maybe a deficiency or disease? Some of the leaf edges have a sort of bubbling

Any thoughts appreciated-----

There is an axiom I use IF in doubt flush it out. You do this with 1/4 strenght nutes. Is that coco coir.? Is the light always that far from them? A 400watt hid should be safe at 10" above the plants. Did you recently transplant to those huge pots? VV