If I were building a new tank and had the option of having it drilled where ever I wanted....I'd skip the tunze/seio and do the closed loop every time!
I'd have the intake for the pump drilled about halfway up the back with at least 4 other outlets both on the back and rising up from the bottom, using loc-line to direct the flow...For a tank as long as the 125 is going to be, I'd have a closed loop system on each side of the tank....the flow rate is entirely dependant on which pump you choose....bigger pump would of course equal more flow so you could customize it by just picking the pumps you want....but with such a long tank, to get any flow you want, doing 2 CLS would be easier than trying to manage a single large pump...
Only one return pump should be used. You'll have a very hard time trying ot figure out how to run two pump together....For a return pump on dual drilled overflows, I wouldn't settle for anything less than a good quality external pump...this means you'll have to have the sump drilled, but you'll be pleased with the results...A friend of mine has a sequence pump that she has completely abused and it just keeps running...last time it slowed down, she took it apart and found snail shells some twist ties & even a plastic bag stuck in the impellor!!! and it was still working!! just a bit slower but still working...
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