I have 4 of them! I got them because I was told that thy would school together with the serpae, but in my tank, they just hung around on their own mostly in between the plants. I like them. They feed in the middle of the tank so it is cool to see them going after the little pellets the other guys didn't catch on time.
See my sig. for other fish in my tank. As far as water conditions, I kep my tank pretty clean: NO3
=0, pH=7.2. They seem to be quite happy!
I think they must look pretty cool under moon lights. That is something I will get one of this days. 8)