I inherited my in laws 50 gallon tank, and I know what all the rest of the fish are but this one velvety black big eyed fish. They suspect it is a catfish of some sort, and picked it up from a free tank at our local fish store. He is about 6 inches long, and spends most of his time trying to get under everything in the tank including the other fish. I want to make a more comfortable home for him, but don't know what he is or what he needs.
I apologize for the horrible pictures, he and the pleco wouldn't cooperate very much.
![Image](http://www.steelcrucifix.com/temp/w%20016.jpg)
(Ignore Goliath's head in the picture.)
Any help in sending me in the right direction would be very much appreciated.