 鲜花( 0)  鸡蛋( 0)
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It might be ick, an infection of the parasite Ichtyopthirius.
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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.# k( y6 @$ f, w( ^
; c+ ~1 q% L& s7 M9 hIt might be hard to keep all the infected fishes, but treatment is necessary to protect uninfected ones.
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" m! S( O8 u8 z n& v3 s3 Q# xBy the way, is it necessary to have >20C for koi and goldfish? |
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