First time grower ..all autos between 2 and 4 weeks old I'm I'm fox farm Of I have fed only RO water and a little cal mag last watering 3 days ago I tested run off and had a super high reading around 1800 plants seem happy and have started to really thicken up . Question is should I start feeding nutes or just water till that ppm reading comes down.? I have fox f trio on hand ready to go any advice would be appreciated check out photos and any critique or suggestions would help. this is my first grow and really want to learn this craft .