Ok,
I did my res change yesterday during my break from work. Started week 4 of flowering nutrients. 2 tsp grow big per gallon, 1 tbsp big bloom per gallon, 1/4 tsp cha-ching per gallon. Gives me a ppm of 1050-1100. I got the ph to 5.8, went back to work, checked them this morning, ph was 6.4...