If you ever hook a venturi skimmer to your system, you will never buy another needle wheel type ever again. Even recirculating needle wheels are lack luster in performance compared to venturi driven type. This is why commercial aquariums use venturi's types.Best advice I can give is think ahead when you purchase equipment or you will end up spending more money down the road to upgrade things. I have an IM100 EXT and I'm running the Octo 200 Elite INT and it's great for my system. If I were running a 200 EXT I would look at the 220 series skimmers from Octo.