Split dorsal fin?

CarpCharacin

Cyprinus carpio
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Today I was looking at my electric blue haps and I noticed that one of them had the back of its dorsal fin sort of split in a few places. I am not completely sure if it is fin rot or fin nipping, but I suspect that it is fin nipping. What do you think? It dosen't look that bad.

The tank is 40 gallons and there are 3 male electric blue haps in it. The other haps look fine. I
 
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