fins splitting

[clowninround]

My clownfish has a split in one of his front fins...he had one in his top fin that eventually developed into a small missing piece. I have pictures but I do not know how to post them.

 

[quarryshark]

Here are the pics, sounds like someone is fighting.
Any other opinions? What are you tank inhabitants?

 

[clowninround]

Thanks Kurt! Besides the 3, 6 chromis, a blenny, and a green manderin. I truely think that if it is fighting that it is these 3 in the pic. At first it was just the clown and the manderin. The clown had his little cave in the bottom left of the 1st pic. Then I added the chromis and the hawiian tang....In QT, she had no marks, but when I put her in with the clown she started swimming down into his cave all the time, so I assume the nasty marks are from him. Then I added the blenny and yellow tang (again no problems in QT), and the yellow tang who was terribly shy in qt turned into a monster. He pushed the clown out of his little home. I know the must be fighting, but will this cause fins to split?