Cream Mandarine XL Auto & Jack 47 Auto

The compost plants have only continued to yellow rapidly I'm sorry to report. On day 39 I watered with 2.5 ml/l Bio Bloom, 0.25 ml/l FloraMicro and 0.5 ml/l FloraGro. Today's day 42 and the yellowing has worsened in the past couple of days again, so I have increased to 3 ml/l Bio Bloom, 0.33 ml/l FloraMicro and 0.66 ml/l FloraGro. The coco plants are getting bigger and stretching out a bit more. Both faded a little from the bottom up, the EC went up to 1.5 on Sunday, still a 1:1:1 ratio of Flora Micro:Gro:Bloom. The compost plants were watered on day 46. I added 4ml/l Bio Bloom and also 0.66ml/l Flora Gro. They don't seem to have increased their water demands much now they are flowering, this was 4 days since the last watering, and they absorbed just a bit more than a litre each. The coco plants, on the other hand, have stepped it up in the past few days and can now take up to a full litre each per day. They still seem to be suffering symptoms of magnesium deficiency so I added a bit of Epsom salts to the nutrient feed for a batch on day 47. I dissolved some Epsom salts in a small amount of water to make a strong mix, which I then added gradually to my tapwater to raise the starting EC from 0.5, to 0.6. Then I added the rest of the nutrient mix. This time it was 3.5ml of Micro, 2ml of Gro and 5ml of Bloom, plus dripclean. The end result is EC 1.5. This time I pH'd to 5.9 - I have been adding less acid until now and following advice that the coco can buffer well so long as it's less than 6.5, so I had been going to around pH 6.2/6.3 each time. However I wonder if that applies less when the nutrient mix is dripping straight onto a thick rootmound under a Blumat, there isn't much coco left there any more.