- Aug 28, 2015
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I have a large (3000 gal) pond with a waterfall. A few weeks ago I lost a fish. Hadn't seemed sick, although I noticed its color had changed a bit prior to dying. Today I noticed one of my large, all white Koi looks completely bloodshot for lack of a better term. I can see veins all over its body and a few sort of bruised/red/purplish patches. We recently had a lot of rain, but the pond looks pretty clear. I treat it with something for algae and to enhance good bacteria about once a week. I did check the PH and other things recently and it looked good but this fish definitely looks like something is going on. I will try to take a photo but it is hard to capture due to reflection on the water. The fish that died in retrospect also appeared to be getting a pink hue, although I attributed it at the time to normal color changes that Koi sometimes have. What could this be from? what should I do? This Koi is maybe 10 inches long or so and has been in the pond the 3 or 4 years I have been here- it came with the house.