[ozyreefa]

Quote
The turbine would decrease the flow, so in order to get the same amount of flow you originally had, you would have to increase the wattage of the pump by more than the wattage put out by the turbine.


This is not entirely correct. Putting a turbine into, say, the pipe that heads towards the sump in a bulkhead overflow setup, will not require a bigger pump, but a larger over flow. There is absolutlely no resistance put on the return pump by putting anything into the overflow (unless your entire display and sump are completely airtight, which of course, they are not), however it will take more water above your overflow level to balance out resistance in the pipe from the turbine( higher water level means increased pressure into the overflow pipe itself).