fantastic grow so far, nice recovery from week 4. Why are you using ph down? Is your tap water above 7? whenever I have shot for ph 6.5 the soil ph has to be monitored when adding nitrogen to avoid drops as a result of nitrification. Always best to add something like dolomite lime. I just feed at ph 7 now and no worries.
Also, be sure to let us know how the cbd blackberry kush feels like... Wondering how stable its genetics are with respect to thc content
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