Agree, I'm with tinder thumbs,
cal-mag for sure. GH
calimagic is calcium bicarbonate while
botanicare is calcium nitrate. Both great products but
botanicare hits your plants quick,
calimagic is better for supplemental use(my opinion). Take a pic of the ugly purple leaf "without" your LEDs on. That's the leaf you should show, although the yellow veins are the first indicator. your leafs look great though. I love LEDs but switched to a HPS for veg. *note: some yellowing and necrosis is normal and part of the cycle of a leafs life. As long as new growth is vigorous and green then you are good. This plant(Durban poison), is in a personal super soul/coco mix and I supplement with GH calimag and save my
botanicare for my deficiencies. I'm big in mainlining, HST,LST, and topping since all of my specimens are in veg for 6mo - year minimum under a 24hr transitioning to 18/6 and 12/12 for flower.