Seemed like growth was slower than it should be. TDS of runoff was 1300 ppm. Not good. Ran 1.5 gallons of Cal-Mag water through each. Now TDS is 1000 ppm which is probably still a bit high but I'll wait and see. This was my fault for not rinsing the new coco coir bricks like I should have and did do on my first grow. Lesson learned FAFO!