Rosetta Stoned XX - Brothers Grimm DWC

Minor defoliation. One thing about this plant is the nute solution drops in pH. 3rd week in a row where the pH was in the low 5s. It's not from her drinking more water than nutes because the ppms were only 450. So she's eating more nutes than water. She must be excretion an acidic waste product into the water solution. She's the only plant in the tent that has this happening. Overall she looks really good. Some slight marbling on the leaves but I think this is related to the pH drops. I am thinking of starting her at like 6.3pH since she seems to drop the pH instead of raising it.