I agree the soil looks VERY dry, & these plants r shocked from the strong mh and the heat in the room. they should definitely perk back up in a day or two. with that heat its going to be hard to overwater, so make sure when u do water it is all the way through until it comes out the bottom. Start using the "water by weight" system to make sure u r not under or over watering. water ur plants till the water starts coming out the bottom, set down, re-lift & make a mental note of how heavy they r. Then check in 2 days by lifting the pot. U will soon know when they need to be watered to feel that "heavy" again. U dont have to worry much about water getting on the leaves, sometimes that will burn the leaves when the light is too close.