Then yes, it for sure will grow back. I noticed one of my angels had one ventral fin shorter than the other. Odd, since I didn't know which fish could have done it, besides than the other angel. Although, the other angel only really just chases and pushes. Anyways, I did notice that it grew back to equal the size of the other.
There is a good chance it won't grow back. It might not have ever been there in the first place. Lacking one or both ventral fins is a common deformity in young Angels. If this is the case, the breeder should have culled the fish early on.
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