The tail doesnt know whats wrong

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　　In the same fish tank, the koi is still fine.The tail of the goldfish seems to be rotten!
========How did the fish friends of the Xianglong Aquatic Alliance comment==

　　Dry Mountain qq Yuyou said: keep good water quality, wipe iodine wine in anxiety, if other fish will bite the wound, it must be isolated
One group and one camp Yuyou said: Use medicine, or raise them separately.
＠Ey1CV Yuyou said: Remove the potassium permanganate medicine bath.Or iodophor wipes the body.Wipe off the yellow powder, then use erythromycin ointment!
Mortal wei002 Yuyou said: All goldfish are like this, koi is fine!so afraid!How long can arowana grow in January#What is best to feed yellow dragon fish~How much salt to put in the fish tank&How long can arowana grow?*How big is the silver arowana%50 cm gold arowana will take a few years to grow$How long does it take for the golden arowana to reach 50 cm$What is the average lifespan of Arowana%How long can arowana grow in half a year(Does the arowana eat a lot?"The tail doesnt know whats wrong！

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