I've just noticed tonight that my Banggai's left underneath fin is torn a little bit - it's got a small chunk missing out of it that was there before.
I think it may have happened earlier tonight during feeding time - I think they both got a bit excited and my clown may have nibbled on his fin by accident when going for the food. They get on great (have done for months) so it's likely to be an accident rather than anything malicious
Anyway, will his fin heal up do you think? If so, how long should it take?