I currently own the Eheim Ecco 2233 Canister filter for an 40-45 gallon aquarium. I currently just use an carbon filter pad and the coarse pads. I like to begin using Ehfimech & Ehfisubstrat media. Will the Ehfimech & Ehfisubstrat media make a difference in filtration? How often to you replace this type of media? From what I read, you can just rinse it off and re-use it. How many times can you rinse and re-use? Thanks.