Should I feed something extra other then biobizz bloom, topmaxx and some calmag,for last few weeks . Keep in mind I used also 4 Biotabs in early veg.
Last feed ppm 800 runoff 1600. Before that 750 runoff 1300.
That runoff seems high to me, I would not feed more, rather think about feeding less. I grow under the assumption that if the runoff is 400ppm over the food going in, then there's buildup in the soil.