I always seem to get cal or mag deficiencies late in flower. This time it started at 49 days. This has happened when i have used gh 3 part or floranova 1 part. I typically run 1500 to 1200 ppm in ro water during flower. My ph will fluctuate between 5.6 to 6.2. I dont know how to treat other than flush the plants and dump my res. It didnt work this time however. Is there a way to prevent this in the future. Should i ramp up the cal mag around week 7? Im certain its hurting my yields. The perfectionist in me is irked to say the least.