Thanks for the tips. I raised my light to about 11 inches and they are doing better with the curling leaves. Seem much happier. The reflector I have has glass but is not air cooled. I purchased everything to set that up but haven't gotten to it. I keep a thermometer at the level of the plants and it stays about 77-78°F.

I am confused about the watering schedule for these flood/drain systems. I was told not to water more than 2-3 times per day for 20 minutes total flood and drain time. The plants are in small rockwool cubes within the hydroton, and the flood level reaches these cubes. I increased the schedule today to 4 times per day to see what happens. Raising the water temp to 72-73°F seems to be an improvement.

I do not have a meter yet for ph or ppm but am in the market for one. I take ph readings with the drop test and it stays consistent at 5.5-6.0 for sure. I lowered the nute strength significantly but I have no way to know the ppm. I have a densimeter, I wonder if that would tell me anything?

Thanks again, Ill update the pics soon