thanks for the info rose. i will have to take a look at it.Of those three I would have to vote none as I am totally in love with the Marineland C canisters and will never have any other brand again. EHEIM was the only other brand that I owned and while it filtered okay, it fell apart actually within a year of me owning it and I do not think I am hard on things so I do not think even though it is a good brand I would buy a canister freom them again. EHEIM=plastic inside and out and Marineland C class = metal casing and plastic baskets. PLUS the biggest plus of all is the ease and complete difference in the process of priming. It is so easy to prime the Marineland compared to the EHEIM.