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Red color is usually from Anthocyanin, the same red color in beets. It's usually from colder weather. I beleieve it's an adaptation of the plant to combat colder weather. You sometimes see it in broccoli and 0ther vegetables during colder periods.

What are you using for lights? How far from plants?

Airconditioners will lower the humidity if you have one.

Looks like your plants had some type of fungus and some other problems possibly poor light, ventilation and nutrients. Breaking Bad