I hear and read that many growers rely on tds or ec readings when preparing their nutes during flower. I’m still new at this. I just flipped mine and have changed to a blooming agent that I give every other watering per mfg directions along with a weekly dose of CalMag+. When I mix the blooming agent in my r/o the tds comes out around 450. I grow in Fox Farms Ocean Forest and my plants look great but I can’t help but feel that I’m not giving them enough. I’ve attached a current pic.