Hey All so after setting up and watching my first multi sump system I have had a change of heart sumps>canisters to sum it up! I love the wattage cost compared to canisters and the heating costs also not to mention the amount of extra bio + mech you have to play with, water changes are easy and with these new UVs the disease part even seems to be some what safe. anyways I have 4x180G tanks not drilled which I am thinking of setting up on a sump system, issue is I have no clue nor am I keen on drilling glass and every LFS says I have to bring the tanks in lifting 6x2x2 is not a fun job and the way my fish room is no I am not even sure we can get them out. So I was wondering if overflow boxes are as bad as some make them sound? My online shop sells 2 brands and not sure what I need or how good they are was hoping to get some feed back on them. http://www.aquariumproducts.com.au/catalogue_products.php?prodID=5684&catID=109 http://www.aquariumproducts.com.au/catalogue_products.php?prodID=4465&catID=109 Not sure what LPH I need also any help would be great I am so clueless when it comes to sumps. Also anyone want to give a jab at the smallest sized sump I should be aiming for? all up I believe I will have 720 gallons. I am thinking a 6x2x20 or so would be ideal based on the other systems I have then running 2 pumps which handle 11,000LPH each, I believe the overflow box I need is the first one which means I am looking at 5000LPH x2 = 10,000. Is my math/idea correct would this work? or am I better off running canisters instead of overflow boxes? Thanks guys.