By habrosus, do you mean Corydoras habrosus? I would not recommend this small species of cory in with angelfish, plus they need a group (and the "dwarf" corys really do need larger groups).
A sole angelfish in a 26g is do-able, if you are satisfied with only that fish plus a substrate fish or two. But it is not the best, and not something I would ever do myself, nor recommend. I would return the angelfish.
A Bristlenose is OK, they max out at 4 inches (assuming it is a true Ancistrus species). Males are territorial so I would stay with one in this small a tank space. You can add corys though, or a Whiptail (Rineloricaria parva, not the giant "Royal" species), or the popular "red" whiptails.
The tank is better suited to the other plan you mention, a pair (or trio, depending upon species, as some are harem rather than pair) of Apistogramma or similar dwarf cichlid [only one species though] and some smaller characins like hatchets, pencils, etc. This would be nice.
Byron.