When I look into a saltwater aquarium I see all kinds of just bigger than microscopic life. I have seen at my LFS that they have these bricks that are supposed to seed this tiny life. I would really like to have tons of microscopic and just bigger than microscopic life completing their life cycles in my freshwater tank. But I see none. Does anyone else have this craving? I want my tank to crawl with all kinds of life of all sizes. is there anything that I can do?