I have a reef octopus brand. It's the best HOB I've ever had, and was used on a 220g tank until I upgraded. It had dual pumps on it, and one is bad..the other one I want to keep for a utility pump because it's worth more to me that way than the skimmer is with it. Therefore, you would need to buy a submersible pump that hangs into the tank (with venturi). This skimmer could be cut down and made into a single, if you wanted to do it that way. As it is now, it has two 3/4" pvc pipes that hang into the tank. You could change that and adapt to whatever size you needed for your pump, and be good to go.
I'd probably trade it for something if you wanted it.