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Hey everyone. My soil PH is at 7.2-7.4. I think there’s too much. Dolomite in the mix. How can I lower the PH of my medium? Thanks

My plants are getting really big about 6 ft tall now. I noticed with some plants there is 1 or 2 yellow leaves in upper lower part the plant. It doesnt seem to spread though. Is this normal? They do seem to be leaves that don't get much light either. But I wanted to make sure not a worst...