What kind of flow rate are you looking for Peter?
Well, I can tell you to stay away from the Mag series but you probably already know this. The submersible pumps I've had the most luck with running externally are the Ehiem 1250, 1260, and 1262 but these may not have the flow and head pressure you are looking for.
Ehiem 1260 - +1. Super quiet.
Yes - BOTH.Can this be use Internal or External?
Do you have experience running these externally? I love OceanRunners myself but have only used them submersed.look at the oceanrunner pumps, quiet and efficient. A 6500 would do ya pretty well....
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