Yeah, you're probably right. Maybe you should read more, and post less? I didn't click this thread to explain things other than what the op asked, or to come in here to debate people about nonsense. BUT here you go. Maybe he is isn't using coco, soil, or hydroton? omg what a concept? Maybe he will only be using 4" grodan blocks and thats it? HMMMMMMMMMM... Which would make his post make total sense, and need no explanation to anyone other than people who don't need to know, or probably should be researching more than trying to help . Maybe I'm not here to explain everything to people with 4 posts, or maybe I'm not here to explain things to people who have been a member of this forum for a year? Go debate a rock, because I really don't give a fuck if you know more than me, or whether I know more than you. Frankly the only one person I'm concerned about on here is me, which is why I read more than I post.