Yes. The RD3 pumps are designed for both internal and external use. The 150w and 230w controllers have a feed mode function but if you are using an internal skimmer and run feed mode, the skimmer will overflow due to the sump level change.
Personally, I think put return pumps into feed mode is just plain silly. Doing so allows food to settle into the rocks and substrate resulting in more organic matter in the tank and ultimately higher nitrates vs waste going over the overflow and into the sump where it can be exported. Keeping the pump flowing helps keep the food suspended and allows the food to be distributed throughout the tank so that all corals and fish get some food. Using feed mode will often result in less aggressive fish to not eat as well since they avoid the feed frenzy when a bunch of food is dumped into the water.