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It might be ick, an infection of the parasite Ichtyopthirius.1 z% Z% s# }( f! K
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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.$ v( }2 L, E1 R
; [# @; R0 o8 u5 ~It might be hard to keep all the infected fishes, but treatment is necessary to protect uninfected ones.
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' C; v1 B; ~% H1 o! aBy the way, is it necessary to have >20C for koi and goldfish? |
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