Yea I have a 55 sump too and i had to make my stand higher then I wanted just to be able to get the cup out. I was more worried about the width than the height of it. My skimmer the pump sits inside so it doesn't take up as much room . I'll post a pic so you can get a feel of how much room you need. My skimmer chamber is about a foot wide.look up some of the reef octopus sump saver models they have smaller footprints