Discolored crispy leaves

What typically causes leaves to become crispy and discolored like this? I’m using a ts600 mars hydro. The light is roughly 30 inches from the plants.
I have more leaves like this on a few other plants.

Plants are bag seeds, soil is happy frog with perlite added. I water once the top is dry and pots are light with distilled water.

Any help would be awesome because this happened on my first grow at the start too
 

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