Really need to purchase some Ph Up and Ph Down. Lemon and limes have acids that can harm your root system. Lime powder which comes from the Earth (ground) Can be used to lower Ph, but not to increase it. Also should be using a Ph meter which can be purchased at most local garden stores for real cheap.

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Hydroponic water treatment – phosphoric acid, reverse osmosis systems and supplies=

I use a liquid form plus a Tri-Meter:

Nutra-Dip Continuous Tri Meter | pH & TDS Testing=

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If you are budding the leaves will usually start to yellow at the tips around four to six weeks in flowering or later, untill eventually they are all yellow.. It is natural and I wouldnt worry about it if you are budding. Ive found Miracle Gro 15-30-15 Bloom Booster helps to slow the process.