Stonerdanswered grow question 4 years ago This is actually a deficiency!! a Potassium (K) deficiency to be exact! - lower leaves begin to yellow with tip chlorosis and blotching increasingly spreading to the top of the plant.
Try increasing your "FloraGro" by 1ml/l and the "FloraBloom" by around 0.25ml/l, make sure you water enough for at least 30% runoff (30% of the amount watered)!
Hope this helps! Good luck and happy growing :)