My Goldfish has badly damaged its fin

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Hi

I have 5 goldfish, and today found one of them has been badly hurt. Its fin has been very badly damaged, it looks like it has been almost ripped off.

It can't swim, it is stuck at the bottom of the tank.

I have seperated it from the others, the only thing I can think of is that one fish ahs attacked him.

Please help me, I don't want to lose him.

Thanks

 

[i3k]

Add some stress coat it works good for healing wounds...keep the water as clean as you can so it dont get a secondery infection.