I have kept several species of brotulids and there is one from the atlantic called a black brotula, Sygnobrotula laterbricola. They are also reclusive but they don't hide in holes like the other brotulids, they hover in a cave or under a ledge. I have collected several over the years and I love them, the fin motions is hypnotic and I used to just stare at it as it hovered in a large opening in the rockwork. Mine was active early in the morning and late in the evening, but didn't really come out from the rockwork unless it was chasing food. Still, because it did not hide in the live rock I could always see it in between or under ledges in the tank.
The books say this gets only 3 inches but I have collected a 5 inch one and the one I kept the longest (almost 2 1/2 years) was about 4 inches long. They all did well, eating any meaty type foods and were passive towards all other tankmates but I kept changing the tank around so I usually sold it or gave it away, now that I have a small reef where I could keep one permanently I have not seen one for a couple of years.
