Hello everybody! I am thinking about adding a sump to one of my tanks, which currently is just running on a canister filter. (Skimmer still to be added) but do I need a sump? What exactly do they do as opposed to using a canister? What all is inside of a sump? What should a sump setup look like and what should one have? I've seen a few before, and they look very cool and am thinking of setting one up myself.