I know I have hard water round my way, I think a small dose of epsoms wouldn't hurt.
I've used a bit of PM cal/mg supplement before but didn't get on with it, even at half strength it caused a bit of burn on my Gf x Bb, which allways show's a slight mg def around 3 weeks flower.
Talking of nute burn, I think I've overfed but only slightly on a couple of the plants, got a bit of taco leaf going on but could also be a bit of heat stress as they are close to the bulb, I need a bigger tent for Xmas please Santa.
They are starting to stink a bit and most of them smell Blueberry but with a different sweetness But the very tallest has citrus, orange, skunk funk all the way.
I'm very happy with this.
They are also becoming a pita to move out and back into the tent as they have some floppy branches and are starting to support each other, lol.
Six weeks Sunday, these are gonna yield OK.
Floppy lower for me, I'm sure if they had more room and were strongly lit they would have stronger branches.