Appears to be signs of over fertilization.... Ever fill that earthbox res with just plain water??? How do you measure nutrient strength???

CGI::::::
CanGroIt Reviewed by CanGroIt on . Dying plants, please help Your Equipment: .1) Type and wattage of lights. 4 Bay 24? T5 from SunSystems .2) Distance from tops? 3 inches .3) Reflector type? Included in T5 array .4) Is there a consistent fresh air supply? yes .5) Do you have an exhaust fan and a circulation fan? Yes .6) What are the bulb wattages, kelvin ratings, and schedule? Two bloom spectrum, two veg spectrum, 20/4 Your medium: .7) Specific brand and type of soil, (fertilized soil) and anything you've added to it. (vermiculite, perlite, Rating: 5