Warning- bad carbon will kill

[michika]

I am also experiencing issues. I have had RTN in long established colonies, and most of my smaller frags that I would peg as advance-expert, or expert types. I removed my carbon which look just as bad as Greg's photo, if not worse, and the RTNs have stopped. I did however loose an awful lot of colour from my tank. I also lost three clams, all medium sized; 4-6" inches.

I put my carbon in on the 26th, removed it late evening of the 28th, did a water change, ran new higher grade carbon, along with some other items, and as of today the RTN has definitely stopped. My remaining clams are out, and things are once again opening up.

I'm sorry this hasn't solved your issue Greg, but it definitely was the cause of mine. Thank you for posting this, it saved me even if there was some damage done.