I've found this while searching for different ideas and methods. I've just got my new filter for my new tank and am looking at the best way to seed the filter so that I can stick it in the new tank, ready to go! I have 2 mature established tanks to pinch some sponges from. Thoughts?
http://www.aquariumoddities.com/blog/739/
http://www.aquariumoddities.com/blog/739/