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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.
Why the plant is not tall ?
Plant #1 is dramatically yellowing, I'm afraid it's rootbound :( and the other one is starting to yellowing too... I can try give them more nutes but I'm not sure it's going to solve the problem, any suggestion? 
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.