The UGF is a cheap Yugo, with a poor biological zone, will assit poorly with filtration.
The canister filter is more like a Toyota, most with less power than a good power head. They have there place in the aquarium world by being able to more agressively push water through carbon and other filter materials, they will need constant maintenace.
The answer for first step filtration that I believe you are looking for is agragonite sand. This sand has much more in the way of surface area and filtration than crushed coral, and allow you to have a larger bio load (more fish). Is far less maintenance and can with the right sand clean up crew serve you much better than cc or ugf. It is the first step, natural filtration that closely emulates a real reef. Look for it. Find Southdown, Yardright, Old Castle playsand as they are all cheap and aragonite or calcium carbonate based sands. This is what reefs are made up of and what we want in the aquarium. It is far more logical to go this route than what you have now, sorry, but most would tell you the same thing.
Nothing wrong with using your canister for extra filtration, just keep it maintained and it should help keep your aquarium clean.
Thomas
