Hi Fishlore, So I just received my AquaClear 70 in the mail and it doesn't fit my 75g Marineland rim! As you can see in the picture, it "fits" on the outer edge, but doesn't seem too secure. Is the filter supposed to fit this way, or do I need to cut my rim somehow? I'm puzzled as to why it isn't made wider. P.S If I do need to cut, how would I go about doing it?