John12
Well-Known Member
looks like a N deficiency, plus some light bleach/light burn on the upper set of leaves in that one pic. For one, you should def should invest into a ppm/ec meter and a ph meter. also get some calibration solution as you will need it sooner than later after u have those two tools. But as far as the leaves the yellow ones will not recover. They will continue to yellow out then eventually die. The yellowing/dying of the lower leafs are a normal thing in flower to expect. The main thing you should be worried about is when your new growth begins to yellow out and die, thats when you have a real problem. Also keep check of your light levels, 18" is a good height but make sure that you have a fan circulating the air under the bulb and also hitting the tops of your girls at the same time, if that makes sense. Also how often do you feed them, water water feed, water feed water, etc? It also looks as if you have the "claw" where nutrients may be locked out due to the ph of the water being off, always add nutes first then ph water and adjust if needed.