Wow, I've been busy and couldn't get on here for several days and man did this thread take off. Lol
I can't speak to all of the catfish mentioned here, but my vultures are very easy going with my fire eels. When the lights are on they stay put in their favorite corner, or perched on top of driftwood. When the lights go out, they swim constantly, a lot of times in the current along the sides of the tank. They will sometimes swim in the current during the day too, but usually retreat whenever someone walks near the tank. I do keep my lights off at all times though, unless feeding or watching them, so they never really get a chance to get used to the light. My eels swim all over them and compete with them for food and I have yet to see any aggression, even though my smallest eel is around 9". I got them from Jeff Rapps and they were about 5" and 6" when I got them. They are probably near 9" and 10" now, about 4 months later. They eat very well. I never have to worry about food being uneaten because as soon as the lights go out they eat everything. I have fed them hikari carnivore pellets (the smaller version of massivore), bloodworms, beef heart, raw shrimp, cooked shrimp, night crawlers, red wigglers, krill, and a few other things. They eat all of it. In addition, they are beautiful fish. They like to perch up in their "tripod" position and sit belly only on top of driftwood. They are definitely a great catfish to have.