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Well you could use that but if you later decide to use a bulk head or something else needing to go through the wall you can't do it with an igloo. The rubbermaid tubs at Home depo are anywhere from 8 to 25 bucks and you can use bulkheads on them if needed.

I would put the refugium above or beside the sump but just a little higher.
Drill a hole into the glass tank about 2 to 3 " from the top and use a bulkhead and PVC pipe back to sump. the pumped water into the refugium will then equal the amount of water going back into the sump. That is why I used rubbermaid tub as I just cut a hole big enough for the bulk head and used PVC pipe back to sump. I put the refugium onto bricks and a board so that it was higher than the sump and the return PVC was sloping downwards at a 30 degree angle.