HELLO, monstefishkeepers!! I'm looking for your guys advice since fish stores seem to always want to sell me things instead of giving me wise advice. I have a acrylic 100gallon tank with stand. Under it i have my diy tub with a crate that contains jap mat in the first shelf, bio balls in the 2 and 3rd, media in the 4th. then i have my pump on my leftover space. The only thing that keeps bothering me is the fact that i dont want to spend so much on a hang on overflow system. does anyone have any ideas how i could run my tank without one that would still leave my sump optional for usage? please feel free to post pictures of your sump designs. Any advice would be great! Thanks guys. 