It looks as if the yellowing leaves could have also been caused by the water. I see a lot of run off in your most recent picture, I find smaller cell pots like that typically do a little better, with frequent light waterings. Just like one or two circles with a pump sprayer with the rod and nozzle/ about 20-30 sprays from a spray bottle. Plants have trouble accessing nitrogen in too wet of a soil. Looking great though!
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