Should be fine. Some equipment used for marine tanks are not useful for freshwater application. Protein skimmers and refugium to name a few.
A properly set up refugium will be far more efficient than any normal filter as the plants or algae will take ammmonia straight out of the water leaving no nitrite or (more importantly) nitrate meaning you can reduce the frequency of water changes.An Aquaclear of Emperor Hang on the back type filter would be more effecient than a refugium. It is more practical to have a regular filter.
I have had a FW fuge and it worked out pretty good (and how dare you post something like that).Like you ever had a freshwater refugium