This time last year i had 1 fish that had a few fish pox lumps on its tail since then no other issues. But over last few weeks ive noticed that 3 more koi have what looks like waxy lumps on there bodys and fins, i think its defo fish pox. I thought this was a cold water issue?? as my water has been around 13-16 degrees over the last 3 weeks the waters warming up. Ive done a few water checks and everything is ok. Has anyone got any ideas why the fish are getting these lumps ??? They dont seem to worry the fish as there still feeding ok and acting as normal.