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For the size tank you are doing, and wanting something decent, but not outrageously expensive, I'd use a MAG 3 or MAG 5 pump. They are good all around pumps, and don't cost too much. I use a MAG 3 on my 30 gal reef with good results. The MAG 5 might have to have it's output flow cut back a bit to keep it from over running the overflow.