Ok I would like to say thank you all I have bin brosing ould therds 4 some time now .have found a lot of good info . But at this tine I nead t ask iyo when bilding a hood fore a tank 60 x18x26 how tall would you make it. This is what I will be running 4 lights 400 x2 mh pof balist. Two 60"vho 140w with a work horse 8 balist and some led moon light I have not got yet .plan on next weaknd starting the bild . I was going to go 18" that would give me a tottel of 15.5 " 16" mabey ????? Idk nead som opions pleas and thank you \m/ (~_~)\m/