Ok so I came across an old aquapod 12 gallon aio and I thought hey why don't I use this as a sump with a huge refugium since the glass is scratched horribly and I don't forsee myself buffing it out and setting it up. So my question is what kind of return pump can i use that will fit in the back chamber of an aquapod 12. It currently has an eheim 600 but I'm thinking this is a little weak to pump the water up that high. Any nano sized returns that anybody can suggest or any other modifying ideas anybody have? I'd like a mag 5 but it won't fit. I'm open to ideas, thanks guys.