Power si and Flora Flex

Hey! I’ve been using flora flex new schedule that recommends no cal mag and an EC of 2.4 since week one of veg. I’ve been using power si at .5ml per gallon and a bit of tribus. Everything was going fine until now. The biggest leafs on the plants are starting to get a bit of black spots on them and starting to kind of dry out. I’ve phd my water to 5.8-6.2 so I don’t really know what could be the problem here. Any recommendations?

I dunno since I don't use FF but 2.4 EC seems high.. that's like peak flower EC.

I thought so as well, maybe I’m going to try and give my plants have strength see if it helps