There are
several "wood" or "oil catfish" out there but I believe the most common has to be
T. perugiae, not that it makes them any less easier to find.

They're very cute, very calm small catfish. They're dependant on live foods and can be hard to keep fed. I bought a group of 4 a few months ago, 1 male died after refusing to eat, 2 females just barely started really eating (and are incredibly skinny after holding out so long), the other male has eaten like a pig from early on and has a rather plump belly the rest of his body teeters on when he's sitting still on the substrate.
In deep tanks they will search food at the top of the water with their wiskers extended straight up feeling for live-foods (like mosquito larvae). I cannot offer mosquito larvae ATM so I offer live bloodworm from my fingers and hold them long enough for the cats to suck up as many as they can before falling. I'll repeat this till they're full.
In shallower tanks they'll search the bottom a little but the middle and upper strata become closer and they seem less shy about looking for food. They'll come out ready like little search and destroy machines examining every nook and cranny and huggng any piece of rock or wood for a bit of food as soon as they smell it.
They appear to have very poor eyesight and are considered nocturnal though they'll adjust to diurnal feeding.
They're not very active save for feeding time. They can be territorial wth eachother, when one intrudes on anothers hidey hole you might be able to see some action. Otherwise they're completely benign and peaceful toward other community type fish. Very beautiful as well.
