i have 6 plants in 3 gallon fabric pots under a 675 watt led.temps are around 72 lights on and 68 off, light is on 18-6, feeding sensi grow coco at 13 mls per 4 1/2 gallons, using ro water.
im having problems with keeping my medium at 5.8.-6.0, i stick my soil pen in and ph is around 5.0- 5.4...