My eels
I have had great luck with FW morays at SG between 1.002-1.007. Both of the specimens I have kept lived in my tank for many years, starting about the length and girth of a pencil, reaching over 2 ft and nearly as thick as a toilet-paper roll. They lived on frozen shrimp, goldfish, and any tankmates that would fit in their mouth and swim close enough to get noticed (they get quite blind with age). I like to keep some small fish in the tank, including GSPs, gobies, and oddities as they appear at the LFS. All eventually disappear with a moray that large. This is why I had to get rid of each of them (one on aquabid for shipping cost, the other to the LFS for credit. This last one was acclimated by them to SW, I am told). They were otherwise peaceful. My only ocmplaint is that the beautiful yellow markings on the juveniles faded rapidly with age, leaving a rather bland gray eel. I will not buy another until I can afford a second tank dedicated to larger fish ( such as the scats, monos, and archer also kept in the tank - 100 gal).
My alltime favorite eel is now my oldest fish at over 7 years old. He is a fire eel, now well over 2 ft long. He lives in the same tank as the aforementioned morays. While some sites list the peacock/tiretrack/fire eel family as lightly brackish, most do not. My eel is clearly proof that they can thrive in light to low-medium brackish. He lives on frozen shrimp and backyard earthworms. He has no interest in live fish. He has been known to eat sushi left-overs, especially salmon. He is my jewel! candy red stripe and black/cobalt-blue body.