Pineapple Express 2 - seedsman

I changed nutrients a day early as issue with PH dropping hard for last 24/48 hours. Require top up of 2 gallons of water but issue was additional nutrients when left on water pump. Roots maybe affecting ph probe. Day 5 Still having issue with PH level dropping mostly todo with the probe, as when externally tested ph was ok. Trimmed some of the larger fan leaves blocking light to potential colas lower down the plant.