The Serpaes are surprisingly docile. My dealer actually is the one that pointed that out to me. He says that he has been getting Serpaes like this for about a a year now. I don't know exactly where his supplier is, but they are coming from somewhere in Pennsylvania.
Remember, many of the fish sold today are the products of generation upon generation of breeding in captivity. Our hobby may be expediting evolution for some of these species. Also, the young fish available will have mildly different characteristics by region even within the US based on their genealogy and how breeding has been manipulated up the line. Think about dogs. Within a particular recognized breed, you can find lines that have dramatically different behavior patterns.
As for my nipping, I'm now beginning to suspect the smaller of my two angelfish. I'm not skilled at sexing, but from the behavior I think it is a male. They have grown noticeably in just a month and I can see that at least one will eventually need a larger tank.
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