two things i've done is black and white poly its 5.5mil thick and it works great. also you can get black out canvis its silver reflective on one side and black on the other use a staple gun and some ductape and it should be good
this is my first time with the ebb and grow system. i have the expansion set. i'm using the general hydroponics expert recirculating program. floragro (12.5ml) floramicro (7.5ml) florabloom (2.5ml) diamond nector (10ml) floralicious grow (2.5ml) this is all mixed up for 45 gallons i also added...