Dude I hope you don't think I'm being a dick....but those plants are showing signs of over feeding....when you get that dark green rubbery look and feel to the leaf that is a sign of over fed.
Your leaves you have that are crispy on the edge is nutrient burn too
As bulbi said with the other plants cut off shit roots and i would flush or feed a weak inonic grow. I don't how to stop your ph rising so quick though as you need your air pump on 24-7
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