1, reason: goldfish cocktail may be caused by fish body imbalance, such as feeding sharp food or injuring swim bladder, which will cause problems with their swim bladder. When the swim bladder is injured, they can't control their fins and tails, and naturally their tails will become upturned.

2. Solution: Breeders should first keep their bodies in balance, and a heavy object can be tied to their tails to avoid the appearance of upturned tails. The second is to feed them some anti-inflammatory drugs such as penicillin and amoxicillin to speed up the recovery of their swim bladder. Finally, stop feeding, and try to feed food after they recover.

1. Reason: Goldfish cocktail may also suffer from unfinished tail disease, mainly because of bacterial infection or traumatic infection. When goldfish's tail is injured, they can't control their tail well, so their tail will become upturned.

2. Solution: Breeders can smear some malachite green on them first, or use yellow powder, potassium permanganate, oxytetracycline and other medicinal baths. Take a medicated bath once a day for about 20 minutes each time. In about a week or so, goldfish can recover. In the later stage of breeding, breeders need to keep the water quality clean and ensure the stability of their living environment, which can reduce the probability of unfinished tail disease.