So I am past the dinoflagellate stage and I thought I had my phosphate problem fixed. The last I tested it was visible on my test kit. After two or so weeks of Cyano that has not gotten worse or better I decided to test again. My nitrates have dropped some and well the phospates are either zero or .01, very low. It got me thinking though, the cyano seems to form on my sand and on the dead rock, not my live rock. I started thinking that possibly the sand and the dead rock are deficient, does this have any merit? Why does the cyano like these places better? I am going to start getting that phosphate dosing going again and maybe it will resolve the cyano issue a little better. I never had this problem with my last tank 12 years ago in fact my phosphates were always readable. If I keep dosing will I finally be able to quit dosing at some point?