+1 for Chemi Pure Elite, I have it in my seahorse tank and reef tank, and it seems to do something great!!!! Not sure what it really does, but I have seen great results with crystal clear water ever since! I also think it just had to do something with clearing up all the cyano in my seahorse tank...I didnt change anything except adding that little bag in the compartment of my Biocube after gabe told me to get it, and now there is no cyano anywhere!

MH