1st grow - Auto Northern Lights

Day 43 (May 13) - Fed with 2.0ml/litre of Advanced Nutrients Sensi Bloom A, 2.0ml/litre of Sensi Bloom B, 1.0ml/l of Advanced Nutrients Carboload and 1.5ml/litre of MagnifiCal until approximately 20% runoff. PH of feed was 6.2 and runoff measured at 6.3. Day 45 (May 15) - Fed with 2.0ml/litre of Advanced Nutrients Sensi Bloom A, 2.0ml/litre of Sensi Bloom B, 1.0ml/l of Advanced Nutrients Carboload, 1.0ml/l of Advanced Nutrients Overdrive and 1.5ml/litre of MagnifiCal until approximately 20% runoff. PH of feed was 6.2 and runoff measured at 6.4. Day 47 (May 17) - Noticed yellowing on some of the top leaves, which resembles a Cal/Mag deficiency. Maybe a nutrient lockout as MagnifiCal is added to each feed. Flushed with 24 litres of water with a PH of 6.0 then fed with 2.0ml/litre of Advanced Nutrients Sensi Bloom A, 2.0ml/litre of Sensi Bloom B, 1.0ml/l of Advanced Nutrients Carboload, 1.0ml/l of Advanced Nutrients Overdrive and 1.25ml/litre of MagnifiCal. PH of feed was 6.2 and runoff measured at 6.3. Day 48 (May 18) - Mixed a Magensium Sulfate foliar spray (3/4 tsp of Epsom salt in 1 litre of water). Misted over plant leaves being careful not to spray the buds. Day 50 (May 20) - Fed with 2.0ml/litre of Advanced Nutrients Sensi Bloom A, 2.0ml/litre of Sensi Bloom B, 1.0ml/l of Advanced Nutrients Carboload, 1.0ml/l of Advanced Nutrients Overdrive and 1.25ml/litre of MagnifiCal. PH of feed was 6.5 and runoff measured at 6.3.