Mumma.of.two said:If it was very badly damaged it might not grow back. In most cases it will with clean water. What are the parameters of the tank? Tank mates? Was he nipped at, has fin rot or did you buy him that way? Tank size? What else are you offering him to eat?
Fishie said:The parameters are perfect (ph is a little high 7.9ish)!!! I got him in my friends 10G for now he will go in pond I hope! He is by himself since I cycled my friends tank at my house (he didn't have room). I just offered him flakes I can offer him blood worms, shrimp. My boss said I could just take him home since his whole back tail was off. I think he got caught by a bigger goldfish or craw fish.