Anyone run a sump on a freshwater tank?

[rossb]

Delphinus I too considered this but instead opted for a large biological filter. I only have goldfish and a turtle and they are mess critters. I got a food grade 60 gallon barrel and pump 480 GPH through it. It keeps the water quality excellent (O nitrites/amonium). I use the water to keep house plants alive and the nitrates makes the plants grow very well.

Have you ever tried a protein skimmer on freshwater??