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The Loach Forum Archives (5)

Columnaris infection: Safe levels of salt

Posted By: SimCan <slockie@dwpv.com>
Date: Tuesday, 25 March 2003, at 12:26 p.m.

A (non-loach) fish in my tank has a discolouration of the mouth (i.e., the mouth has lost all colour, and is now whitish). No growths, no fuzz, and he/she is still eating and seems otherwise to be in good shape, but I believe it to be the early stages of columnaris (mouth rot, or cotton mouth), a bacterial infection.

While columnaris is always present in every tank, it can take hold in stressed fish, as it has, I believe, here. I have removed the only fish showing any symptoms to another tank, but would like to treat the main (110 gallon) tank as a precautionary measure, ideally without hurting my biological filter too much. I have done a ser