Sphagnum moss has some antibiotic, antifungal properties that CPs really like. I think it also sucks up nutrients in the water, making a good media for CPs to grow in. The best way to get live sphagnum is to buy some from a nursery - orchid and CP nursuries are good places to look, especially online. PetFlytrap here may have some themselves. Once you have some, you can propagate it easily on the tops of pots and en masse in larger containers. Basically, you just take some dead LFS, fill an undrained container with it, put the live stuff on top, and keep it kind of soggy. With enough light it will grow like crazy.
Best luck,
~Joe