I dont have personal experience with any of those pumps, but I have heard the Gen-X inline pumps are failry quiet? I think these pumps are also comparable to one of the types of Blueline pump series? If so, (they are almost exactly the same I think), they should handle alot of head pressure individually, as well as they run cool, and quiet.
I would also think that running a single pump would do you better for wattage than two pumps?
Just a thought!
Cheers,
Chris
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No more tanks  - Laying off the ReefCrack for awhile!
Cheers,
Chris
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