Ive had an Emperor 280 for years now but want something better. Thinking about the Marineland Multistage Canister 360. Any opinions on it? Also, there are 4 trays. Which types of media should go in it? Ive heard the bio balls aren't that great. That leaves carbon bags, corse foam, ceramic rings, and polishing pads. What is the maintenence schedule like for a canister like this? Change everything every 3 weeks or so?