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Your plants show signs over overwatering and/or over fert.
The burnt leaves in one of those pics is a dead ringer for nute burn. Also in the last pic I noticed a few of the plants drooping, which is a sign of overwatering (potential root rot).
How often are you watering?
How much nutes are you giving?
Heat would not be burning the bottom leaves like that.
I would recommend giving your plant some plain water with fish emulsion to balance out your Nitrates, to avoid what may be in the process of a salt-lock created from your other ferts.
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