I've got one on a 180. Clogged fairly quickly the first month or so, until I stopped mucking around in the tank. I also started wrapping a piece of filter floss around the intake, does a great job as a pre-filter if you're mucking around a lot. If you go this route, make sure you clean the filter floss regularly, or else any 'clear' patches on the intake have greatly increased suction, and any fish fool enough to try and suck the algae off gets stuck. I lost one of my juvie ABN's that way. Great filter though, extremely quiet. I eventually swapped the outlet for a piece of drilled pvc as a spray-bar at the bottom of my tank.