I have a CSS220. It's O.K. The biggest benefit of it, is that you can hang it outside of the sump or on the tank if needbe. The hang on the tank configuration is the best bet for this skimmer. It is exactly 25 1/2" tall, and you only need like 1/4" of clearance to take of the cup. If you are planning on getting a moderately priced skimmer that you will put in sump, go for the Octopus. If you plan on having it hang on style go w/ the Super Skimmer.