I have salvinia auriculata in my 10g office tank. Whenever I do a shrimp cull, I pull a bunch of the salvinia out and throw it in with the shrimp so they have something to hide in/hold on to. Then I sell the culls/floaters on kijiji. I've actually paid for the initial cost of the flora and fauna in the tank by doing this over the course of a few months. These days my shrimp colony has dwindled a bit, so whenever I have to thin out the floaters, I just toss them on the soil of one of the many potted plants in the office.