When I had angels in the 29, I had a SunSun 304b. When they were in the 75, I had the SunSun 404b. Now that they're in the 125, I have a SunSun 704b, a Fluval 406 and a Tidal 110. Not sure if that helps any, but there you go lolFluval 407 is in the right size range. Any others I should be looking at? I prefer canisters to hob personally so if they both work.