This reminds me of my first grow so much! not training the plants and them growing really tall haha memories! Are you using CFL lighting? Anyway on topic on the short one it looks like tad bit of nute burn on the tip, as the yellowing id say its nitro def and she wants feeeeding they got a few weeks left yet.
ALSO get a PH pen, i dont know what kind of soil or whatever your using but could be your problem also, and esp salts are for cal-mag def.
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if it is cal mag u could try foilar feeding also