All right, things are finally looking up. To expand on my last update, the Blumats were keeping the rockwool either too saturated or too dry, and it was extremely difficult to find a balance. So, they weren't able to supply enough oxygen to the roots and I ended up with some mild root rot issues.
After switching out the Blumats for a timed drain-to-waste system and treating the root root, plants are looking MUCH healthier. They fell behind in growth so I'll be letting them veg another week before flipping to flower.
The two on the front left look like males, not sure if it shows up in the pics too well but they'll probably get the chop soon.
Vegetation, 6 weeks
Peanut Butter Breath (hybrid) from Thug Pug Genetics
Yep, dealt with some root issues early on. I explained it a bit in my previous posts, but basically the Blumat in rockwool experiment didn't pan out. They were keeping the blocks too saturated or too dry, so root rot started to creep in. They're on the mend now and are looking significantly healthier.