I have the 3000 cone internal, don't remenber if I told you. Great skimmer for my appetite,would dark gunk, low power drawn, and it won't accumulate gunk on top of the skimmer body, just in the collection cup, but for that you can get a powered neck cleaner, like I did, I'm amazed with the quality of the NC and I even haven't tested yet!
Only problem I had was the screws rusting in the pump volute, but costumer service responded pretty quickly to me that they even sent me a complete volute with new screws. I won't look at something expensive than this brand, it works and they have quality.
I believe that they would use the same BB pumps, just the 5000 and the quality on the body would be about the same