A. If your fish is housed with other fish, it's possible he may be getting picked on and the fin was torn. Providing extra hiding spaces can help him to get away safely and relax. Be sure to check the aquarium decorations as well, as sharp edges may also tear fins. If your fish is alone, or other fish are also affected, it may indicate an issue with the water or an illness. You can have the water tested at most local pet stores and they can provide you with medications/water treatments to help improve conditions.
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