It's got the euro style braising where it goes around the edge so I can't hang anything over the back. There's just enough room for the pipes of a canisteras the cannister gets dirty the flow is reduced. for some reason I was think h.o.b filter then plumbing it to the sump, but rereading your post I guess the rim is to thick for that.
That's my only problem I can see with this idea. I have like a spill tray that's about 3inchs high that all my equipment sits in so if the sump was to overflow it would run into this tray. If I have the intake pipe close to the top then surely the siphon would eventaully stop when the water level drops and it draws air in? I know it would have probably overflowed by then but my tray would have caught the water so then I would only need to remove that water and clean my tray.
I never thought of that idea. I think I might try and make a small version as a test and see what happens and if my dodgy idea doesn't work then I'll just add the canister? I would like to see if it works tho.You could drill a hole on the intake pipe (inside the aquarium) somewhere below the water line and see if the gravity siphon breaks once the hole is above the waterline.
I have looked at doing this, iv just to modify it over my braising like you said ?
this could be customized to fit your bracing