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It might be ick, an infection of the parasite Ichtyopthirius.1 \, |% K5 Y2 P4 K
$ N2 |5 H% i" r( B& c/ |, BYou 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.
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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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3 T- a# [( w7 L, {* H# b9 g0 CBy the way, is it necessary to have >20C for koi and goldfish? |
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