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I use to use Readygro Moisture loose bag coir. Been using the Canna brick lately. Its just as good as loose Canna or Readygro but much cheaper. But lately ive been having a few problems. Ive been rehydrating the bricks rite in the bag with either cns 17 or Ionic grow at about 1.2 ec (this is including my 0.2 tap water). Young rooted cuts do fine at first but as they mature They get very purple stems and petioles. Leaf margin chlorosis. Iam thinking calcium or magnesium. So i bump that up....it does no good. Now iam thinking magnesium. And its being locked from the potassium thats inherently in coir plus the amount in Ionic at 3-1-5. Do any of you use canna brick and if so how do you prep it? Do you use a mild base nutrient when soaking the bricks? Plain water? Or calmag? Need help. My chem and glue looks like shit.