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How much A+B are you using per gallon and how often ? I see a little tip burn but overall you have nice plants Kell . Try Cal-Mag at 5 ML per gallon to start and give it a week or so
1. Some of the leafs near the top are canoeing. The pant is telling you it's too hot which is stressing it. Up the lights a bit to make it happier.
2. The plants seem to be over watered. The yellowing is not coming from the inner veins of the fan leaves, but rather the whole area which is a sign of over watering. Just ease back on the moisture on the roots and they shold perk up a bit and feel more 'stiff'. Keep in mind that you can get root rot if they are too moist for too long.
You want your upper part of the plants to be 'cresting'. Basically have the fan leaves praising upward like the arm motion of the YMCA song. It's fun to stay at the Y... it should look like that.
Take a look at the top right plant on your second photo. Look at the leaves near the upper portion of the plant and how they are cresting. That's a GOOD sign. Now look at the rest of your plants.
Other than that, you're plants are in great shape. If you get your plants to all crest, I would say you have an above average grow happening and people reading over this should definatly be doing what you are doing with your medium, feeding schedule, resevoir maintanance, and PH.