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That seems like a lot of flow IMO.. is the tank / overflow section loud? The general rule with tank turnover is 5x - 10x your display volume, so you're easily twice that.
Any way to throttle the pump down w/a valve or adjust the outlet? I know the larger Sicce pumps have a knob that you can turn. Not sure about the smaller models.
Worst case you can buy a smaller pump and use the 1.5 for a water mixing pump.
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-Eric
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