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It might be ick, an infection of the parasite Ichtyopthirius.3 e4 R/ z" M+ B3 o- I3 ]
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You can increase the water temp up to ~28C and give them drugs (basically Cu2+ ions), plus large quantity of water change. Google for further details.$ |2 c& l( ~7 z9 u2 u- P5 X0 @9 w, O0 f
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It might be hard to keep all the infected fishes, but treatment is necessary to protect uninfected ones.
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By the way, is it necessary to have >20C for koi and goldfish? |
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