I have used this also. It won't cure it, but it will kill it until you find and solve what's causing it in the first place.<a href=showthread.php?s=&postid=6988758#post6988758 target=_blank>Originally posted</a> by supernareg
serious snapps, although i would recommend the natural way like u did, but i had cyano, and in 3 days my cyano covered tank (and i mean THE WHOLE TANK WAS RED) it was gone... with what you make ask? Boyds Chemi-Clean. BEST STUFF ON EARTH. it will NOT HARM ANYTHING! use it, KEEP IT. I've used it once on 2 tanks, and it hasnt been back for months.