If you confirm don';t have nudi that disturb it, then you can try to use vitamin C. Here is the forum that talk about this. http://reefcentral.com/forums/showthread.php?s=acd430aa7a51fe59cf6acc439e8e1d8f&threadid=1252294&perpage=25&pagenumber=1 I have tried and get good result. Thanks.

淡海水混養不是夢<謎底揭曉>不可思議的一張圖這絕對是事實 Hi guys.. the picture is true and they are using "pi water" .. you can get more info by this link : http://www.piwater.net/public_html/water.htm