AcroporAddict
There is no substitute.
A few pages back, Jeremy recommended a SM 250 for me in my 450 gallon net volume system. I decided to go with a 300 anyways, hehehe! Just got this from Premium last week, and it is kicking butt in my sump. Didn't even need to break it in. I am using a Vertex Vectra Engine neck cleaner/lid with it.