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Hi yeah .... I contacted somebody and got them to come and have a look, the water seems okay, a little nitrite, no ammonia and the Ph is fine - nothing that would get them really sick. In fact, the guy (Colin) didn't seem to think they looked too ill - but I know my fish and they aren't themselves.
He did a scrape and didn't really find anything but it may be costia, which is apparently difficult to detect in early stages. Also the time period is about right for an infestation from the addition of the new koi - which was an import (and is now dead).
So it seems now, that my salt is a little high, need to get that down a bit with water changes and then add a dose of Formalin and Malachite Green.
And hope to hell that it sorts it out ....
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