Advice

I have 4 plants now and 2 of them the bottom leaves yellowed and died . and as far as I know it seems like a nitrogen issue . so I'm just looking for maybe suggestions on what to use( with walmart and Lowe's being my available options) or just any general tips or feedback . they've been on 24 light and fan ,I have 2 led (idr the wattage) and just added an additional cfl bulb . I'm using MG( I tried an organic potting soil but the only one I could find didn't work, so I just made it work ) my humidity and temp stay pretty steady around 47% and 79°. The pics are a top and side view of each , and the plant in the last 2 is like a week or so younger than the rest, and the one above that got repotted because I tried that other soil one more time but wasn't looking good
 

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