fluval all the way! been keeping fish and tanks for what seems like a thousand years and been through so many filters.I love fluval it is the easiest to pop off and on and very quiet i can buy a ton of bio max and load the colum up to equal large canister filters.Also if you go on ebay type in 304/404 you can buy them between 65-80 bucks with free shipping! still scratching head as to why people think other canisters are better esp ehiem had about 10 of them and it felt like having a heart attack everytime i had to take the top off.xp's are all right,but still not that simple way of cleaning like fluval.magnums had those metal clips that break on alot of people including me.