Im considering picking up a 135 gallon for $100. The reason i havent already bought it is because it is drilled for a sump and i have no experience with sumps at all and find the whole idea of one quite difficult as i know nothing about them. I have fluval fx5 filters on all my large tanks which are as simple as dropping in a couple lines and plugging into the wall. Id prefer just to hook up another fx5 to the tank as i have 2 not being used right now but for $100 I cant pass up the deal. My question is what size sump will a 135 gallon need and what size/brand pump. What size plumbing etc etc... Thanks