HI I'm new to keeping Koi, and now one of my ghost koi has a mark like a
thin red ring around the border of one gill. In the centre is a greenish
blotch (that's the only way I can describe it).
Any suggestions would be welcome.
DWDW1

Do you have a quarantine tank to isolate this fish in?

What are your water parameters? What's your usual maintenance regime?

Answers to these questions help guide us on how best to advise. ~ jan


See my ponds and filter design:
http://users.owt.com/jjspond/

~Keep 'em Wet!~
Tri-Cities WA Zone 7a
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