The Colombian Wood Catfish is presumed to be Trachelyopterus fisheri, but there are several similar looking members of the genus. These fish are offered at about 4-5", but be aware that they will more than double, and quickly. Typically found in driftwood piles in the wild, they will do quite well in a heavily planted tank. These fish are not even remotely shy, and will constantly swim in the water column, particularly in small shoals of 3-6 (or more fishes).
Care should be taken when choosing tank mates. These fish are quite peaceful, and primarily surface feeding, but they will devour small fishes -- essentially anything they can stuff in their mouths. They are not aggressive, and should not be housed with fish that will pick on them, either.
Large, active danios, rainbowfish, and barbs are all good suggestions, as are other catfishes (e.g., Corydoras and Loricariids), and moderately sized, unaggressive cichlids. These fish are incredibly hardy, and provided your water is reasonably wet, they should do quite well. Ideally, they should be kept in soft, acidic water.