I agree, serpaes can be kinda nippy, but then again some folks (JC, I'm lookin' your way) have success with keeping serpaes with long-finned fish, like angels. They are really cool though, and super colorful for a tetra.
I clicked your "my info" button and didn't see any tank specs. If you will tell us about your tank (size, inhabitants, filtration, etc.) then we can be of more help to you.