I've been running a Remora C Hob on a 30 gal for three years. Performs well, once you find the right height for the collection cup. I also have a spare one from a tank I took down. It's for sale if your interested. Comes with maxi-jet 1200, overflow drain, and plug, if you don't want to use that feature, and a baffle ,that has made it quiet. Like new condition. I don't have the overflow box for this one.