Why are my plants so limp and purple?

These plants got exposed to some cold air around 55 degrees, the grow room went down to about 65 for a whole night while the light was on, and ever since then they have been droopy and limp. This has been going on for 3 days now, and before that night they were very perky looked great. Is it possible they are still recovering?

Yeah the cold probably just stunted their growth a little bit
Wait a few more days and they should be back to normal.
You aren't over or under watering are you?

no same as before when they looks great so it cant be the watering

If I let them dry out will they still recover?

I don't think this is root rot because I water these little cups every other day, (its under a 600W) and the soil on the top is crusty each time I water and there isn't much weight left in the cup before watering.