Color leaves.

first make your grow area tidy, what those dead plants do there ? next ph and feed, sort those two. Too much nitrogen blocks absorption of other nutritions, too long water in pot ( aka plants not drinking) changes ph Good pot size and quality helps to grow a lot. I had those diy days too, but if i would start now, i would buy right stuff from start, instead of slowly crawling there and biung not good stuff on the way .. Happy Growing !!

It would be best if you could fill in your diary a little bit... and at least tell us what diary this question is about.... but you have nothing about nutes, the amount you're giving them, pH, nothing... just pictures - not helpful to us when we really want to help you!

Calcium deficiency = yellow/brownish dots or spots or blotches. Yellow leaves = something else. Close up pics would help a lot. Could be lack of root room and depleted soil from growing in tiny pots or a potassium deficiency or a phosphorous deficiency or a lack of trace elements or a combination of all these things. More detailed questions would also help.

Soil or soilless? PH seems a lick low for soil

I took this picture before watering BioRoot Recharge Bioweed Cultivation nation veggie Superthrive I use the appropriate measurements that’s on the bottles Ph 6.0-6.1. I was using calmag when I first notice the yellowing but kinda gotten worst So I’m using oyster shell for higher calcium Any advice