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It might be ick, an infection of the parasite Ichtyopthirius.
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4 ]% g# k- m1 A9 p/ J; j1 AYou 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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3 L6 z; Z7 s" h# `% q! B1 FIt might be hard to keep all the infected fishes, but treatment is necessary to protect uninfected ones.5 `6 P/ A R0 |6 x, Z2 x& [
" O2 O; r% j; O" L* C3 Z& _By the way, is it necessary to have >20C for koi and goldfish? |
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