It's reef safe don't remember the name have a ton of them they are very good and you can't buy them they come as
http://blogs.thatpetplace.com/thatfishblog/2010/06/14/what-is-that-in-my-aquarium-part-1-stomatella-snails/?wprptest2=0
Just feed normal and the p04 will rise on its own I have all ready ran some test similar to this o don't change your water till you reach .10 po4 if you have more ???? You can call me at 9499338190