Leaves are brown, yellow and some turning a faded green

[TheDude777]

Leaves are brown, yellow and some turning a faded green

I'm growing white widow in promix hp in a grow tent 3x2x3. I'm using 2 T5 sunblaster fluorescent. As far as nutrients I'm using optimum hydroponics "grow" a and b...

I noticed the issue about a week and a half ago. It started with the bottom leaves and it's working it's way up. I thought it was a nutrient problem so I did a flush. No changes. Well at least the issue is still spreading. I gave them some nutes 2 days ago but no visable changes yet. I've been looking for pests but no visable ones. One thing I did notice is some irregular growth on a couple of them. I will attach some pics to show what I mean. I need to figure it out soon otherwise I'm going to lose my babies. Oh 1 more thing. I started from seed and they are from a large Canadian supplier. "King".

Any help would be much appreciated and the quicker the better please. Thanks

 

[Aloner]

It's hard to tell for sure from the angle of the photo but it sure looks like it's outgrown the pot it's in. It could very well be rootbound, which can cause nutrient lockout.

GWE on rootbound plants