Thanks for the replies!
I want it as a return pump for a 20 gallon tank. The 600 (160 gph) says max head is 4.3 feet, and I will have 3'7". I'm just wondering if I'm going to get a lot of head loss being fairly close to the max. I would prefer to have 120-150 gph through the sump, and definitely don't want anything less than 100 gph.
Maybe I will email Eheim.
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~ Mindy
SPS fanatic.
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