Hi all. I’ve been using Biobizz grow, bloom & topmax in my AF & PP grow and have noticed something odd happening. Typically to make PH’ing the blends easily, I’m mixing maybe 3.5l at a time in small transparent containers with a tap at the bottom, this makes EC & PH measurements really easy ‘cause I can decant a small sample into a cup & test. However, after 24 - 48 hours in the container, I’m noticing that the “veg” mix (Biogrow 1ml/litre) which started at PH 6.4/6.5 is now PH 7.1/7.2 and an oddly disgusting smell has begun to come from it and some white scummy shit has formed. It happens to a lesser extent with the “flower” blend (1ml grow, 4ml bloom & 4ml topmax per litre), but still happens nonetheless. Has anyone experienced this? are my nutrients “going off”? Could this be related to UV light by any chance? Opinions welcome! Thanks!