Do you prefer to have a water pump inside or outside a tank?

[The Grizz]

My personal preference is to have them outside the sump so that they dont add heat to the water column.

[subman]

I've always run internal but thats always been because my setup wouldn't allow it any other way. I see what Grizz is saying but in my case I think the heat is a benefit as it just means my heaters run a little less. When I was running MH I really could have used external pumps.

[AquaPin]

My tank is in the basement, so the little bit of heat the internal pump generates is fine with me. Plus less hassle, the pump has a PVC going to a hose that returns the water to the tank.

[sphelps]

Originally Posted by The Grizz

My personal preference is to have them outside the sump so that they dont add heat to the water column.

I'm the opposite, internal to take advantage of the added heat

[lpsreefer]

Originally Posted by sphelps

I'm the opposite, internal to take advantage of the added heat

Agree if my heater doesn't have to run as much because of my pump I'm happy.

[kien]

My personal preference is to have them inside the sump so that they do add heat to the water column.