I have a 8 day old dinafem cloud 9 it was looking great until last night leaves drooped and turned yellow from the center of the plant outward toward the leaf tips please help light 2 40watt 2 15watt 6500k floros 24 hr on 3'' from top medium rock wool 1.5in cube water distilled ph 5.6 dry cube weight 5 grams wet weight 25 grams I water when cube reaches 7 grams usually 24-30 hrs no nutes yet temp high 81F low 74 F