When a goldfish has a rotten mouth, we need to find out the cause in time and treat it accordingly. It may be rot caused by fighting, it may be rot caused by bacterial growth due to poor water quality, or it may be rot caused by external stimulation. We need to Find the cause as soon as possible and then treat it symptomatically.

Tips:

Goldfish is a very easy species to raise. If you are a novice in raising fish, you can choose to raise goldfish first. After you have enough experience in raising fish, you can then raise other fish.