Gizmo7415;5117184; said:what are the benefits from using a sump instead of a bunch of canister pumps?
Lots actually. You can move more water through more media in a sump. It gives you a place to put heaters and other things you don't want to be seen. Your tank level stays the same as evaporated water only changes your sump level. Lots of folks use their sumps to isolate fish that need a break from other tankmates and don't have a dedicated hospital/qt tank. Filter socks are cheap and easy to switch out as opposed to shutting down, removing and cleaning out a canister. Takes just a few minutes to change them. It adds volume to your system which usually means cleaner water for longer.
Using multiple canisters will work fine, but you'll see all the plumbing and maintenance is alot more difficult in the long run. Sumps are more work to set up but require less and easier maintenance. Canisters are easier to setup but harder to clean over the long haul.