The red pot is in week 10, the black pot also on the left is week 9. The green pot is week 7 and the two black pots on the right are week 6. From the tent photos you would think it's the yellowed leaved plants that are oldest, but they're not. I think they just grew bigger and taller than the others and are using up the nutes faster.
I think I might start actually measuring pH and dechlorinating my water. My yields don't look like it will live up to my first grow. The right most plants are bigger and only week 6, so I think I will get at least 1oz. I'm going to be adding some silica and cal mag to my nute routine soon to see if that helps.
Some of the leaves are yellowing on the older plants. I haven't looked at trichs yet. I'd say 70% of hairs are orange on the oldest plants.