I never had any problems when I used it, I fought with the cyano for a long time before I tried it and it worked. OP use it on a regular basis without problems, IME it was not a band aid, it got rid of the cyano and the tank thrived after that. Sometimes cyano rears it's ugly head and no matter what you do with regular maintenance you can't get rid of it. Chemi cleans works and a lot of people use it.