Wooo 8 is too high for MJ but then again mj is a kick ass plant. I had 1 one that kicked the bucket i mean layed over and wilted like crazy yellow and shit. So i put the B to side with no light no water came back couple days later to get rid of her and shes standing taller then the rest.MY PH IS AT 8 PLANTS R BEAUTIFUL VERY HAPPY WITH THE 300 WATT LED RED BLUE ORANGE... MY PLANTS LOOK GRETA BUT I NOTICE THEM TURNING SOME ON THE LEAVES YELLOW SOME..HOW DO I LOWER MY PH AND IS THAT U THINK MY PROBLEM IS??? THANKS WILL BE UPDATING...WITH PICS...