The logical solution to adjust pH downwards. This product consists of 24,5% phosphoric-acid. Because of the low concentration it is safer and easier to handle then it’s big brother. It is strongly advised to use protective clothing and goggles while using this product.
I'm experiencing some yellowing of the tips in the upper/newer growth. Light stress? Nutrient burn? Deficiency? Ph related issue? Should I do a flush with plain PHed water and check the ph of the runoff? I will do some more pictures tonight with the grow light off. 
I noticed some weird little browinish/beige dots near the veins of some leaves, mostly the upper/center ones, those exposed to the light. I checked for bugs everywhere, even with the jewel loupe, and I haven't see one. What can it be? Maybe heat/light stress? Can this be used when growing organic? My tap water has an high ph (8+), and I was told that this is too much to handle for soil's bacteria.
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I spotted leaf miners' damage on a couple of leaves and an adult fly. What can I do to prevent them to spread and get rid of them at this stage of flowering? For now I'm trying to low the humidity a bit more to make the environment less ideal for them. 
