Dorsal fin grow back?

I'm assuming you mean something took a bite out of the fin, and not that it's gone completely. When I bought my clowns, one had two different fins that had been nipped to about half their normal size. Both fins were totally healed in under 6 weeks.
 
I'm not sure if something took a bite out of it or it was born like that. But they were babies when I got them. It has been more than two months now.
 
Mine had actual bite shaped marks out of it's fins. If it was a birth defect, I'd say you won't see any improvement. You can't see any new growth? Even before the fins on my clown were fully healed, they had a little clear section of skin that started growing back first.
 
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