Ok if ur plant is underwatered it will jump back to life when u hit it with water, if its overwatered it will continue to droop and get worse. It could be heat aswell. The heat ussually contibutes to the underwatering. But u will also see signs of heat stess. ex. the leaf tips will brown closest to light. unless ur grow room just gets to hot stay under 90f if possible best results under 80f.