Well, I got some more today for free! And Caulerpa and most plants, are a critical part of the Nitrogen Cycle. Ammonia is the most toxic and is the first stage of the cycle, then the nitrites, and then nitrates. Peanuts, and seeds act them same way, those chemicals act as fertilizer for the plants. If you ever go and buy some fertilizer for your lawn, it should contain ammonium nitrite, which is very dangerous, and that is also how a fertilzer bomb is made.
Right now, I think I have like 6 different types of it in my tank- Madiens Hair, Halimeda, prolifera, taxafolia, grape, and some type of algea that is kinda purple, blueish, and looks somewhat like colt coral. I'll get a pic of it up soon, my mom has the digital camera.
-Mark