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I am not a fan of Mag pumps. They run hot and use more power than comparable pumps like Eheims or Ocean Runners. I use and like the Ocean Runners, I have 3 of them on my 100. An OR 3500 will probably give you around 750-800 GPH at 4 to 5 feet of head. I imagine an Eheim will be about the same.
My baffles are about 1.5 to 2" apart in an over-under-over configuration. Thats far enough apart to get a cleaning brush or Mag Float down between them if I want to clean them.
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