Yellow leaves

[Hondo4921]

Hello all. 2 of my plants started showing signs of yellowing between the veins on a few leaves, at least I think so. The leaves I'm seeing it on are some lower ones but also some of the bigger fan leaves about midway up. First time grower and I haven't been checking ph in the water, I know it's super important and a friend already scolded me. Plants are in 5 gallon fabric pots with fox farm ocean forest soil. Fox farm nutrients have been used throughout also. It's just these 2 plants as the other 2 I have are both different strains. I thought it may be magnesium deficiency but don't want to screw up this late in the year. Leaves are also close to the center of the plant or down low so is this maybe just a sunlight issue on a bigger plant? Also have had an issue with all 4 plants not taking water as quickly as they used to, started maybe a week ago or so. Not sure if related or normal, figured I'd mention it. Any ideas, suggestions or guidance is appreciated as always. Thanks.

 

[crucialbunny]

The plants look healthy and some leaves appear to be aging out. Looking good

 

[Hondo4921]

Thanks for the response. I just harvested my first plant last Saturday, an auto pineapple express, and it came out awesome. Don't want anything to go wrong with these bigger ones now that they all seem to be starting to flower. Excited for the fall now.