Disease/nutes issue - still not improving

Hi there! Can you measure the intensity of your LED light? Too intense lighting can cause symptoms like cal/mag deficiencies. If your lighting is precisely set, low temperatures can also be a problem. I wish you a bountiful harvest!

First you must measure the pH in the soil and it must be as close as possible to 6.5 (6.7 is high but not enough to present that damage), then, EC in the range of 1.2 to 2.0 mS/cm, to measure it you must water until Let water come out from below and then use the sensor to measure the EC of that water. Possibly the EC of your plant must be low, if this is the case, it is recommended to water with mineral nutrients to quickly recover the recommended EC (taking care of the PH throughout the process), if the problems persist you should look for the specific shortcomings of your plant. . As they say in the other comments, the volume and frequency of water is important, I recommend watering when it is dry, to know this you must take the weight of the pot when the plant is dry, so you will know how much % of water there is.

Without a diary and/or a lot more information..........impossible to give accurate advice. Substrate? pH in / pH out in run off? Nutrient schedule? Lighting schedule?

hmm. Your plants looks like they are starving. So anemic looking. I'm wondering if you are keeping your soil really wet, and that you may have some root problems. A product called hydro guard can help deal with that. I think Botanicare makes it. You can also use a root enzyme like hygrozyme, or sensizyme. They will go after any rotten root material and break it down into nutrients for your plants to absorb. Your pH is a touch high for my taste, but it's not so high that it would cause your plants to look like that. Don't keep your soil wet all the time. It needs a dry out and water schedule, not constantly wet.

i am watering with 6.4-6.5, 6.7 runoff

Whats your soil pH?