Thanks for the reply Ranzan. And to think....we were looking at getting 180 gallon tank! lol But we really weren't thinking of tankmates for it.....figured it might be safer not to put other fish in there that could, and probably most likely be lunch, dinner, snack, etc. Of course that's a really big tank to have one fish, (or eel), in. We had an lfs here that had one in what I think was either a 120 or 150 gallon. We've had messy eaters in the past and understand the importance of water quality. We do weekly water changes......religously. You can almost set your clock by it. Anyway, thanks again for the reply. Would you, or anyone else know where to find more information about them?