This is the ubiquitous 'bristlenose' catfish in the aquarium hobby and is bred commerically on a large scale although it's precise origin is unknown with some of the opinion that it may be a hybrid. Several line-bred ornamental varieties exist, including piebald, albino and long-finned forms of...
www.seriouslyfish.com
Yes this tank would work for one or a pair - probably not for 2 males. Warning: they are likely to dig up your plants and re-arrange your tank furniture if they don't like it. They are peaceful though. Mine is actually longer than the stated size (about 17cm). Its also a longer commitment than most dogs

- I've had this little chap since 2004