A twig catfish isn't a good choice either, they are poor swimmers, need a piece of DW at least as long as they are but preferably longer but mostly they don't do well in new tanks and need plenty of room which they won't get in a 29. I only keep 3 in my 220g. They also don't tend to eat any additional foods you put in the tank but they have to be offered it. So with that in mind there has to be enough natural food, algae, bio-film, DW, etc., in the tank in the event they won't eat addition food put in the tank for them. They are very gentle fish and are very easily outcompeted for food sources. They are also not fond of bright lighting. I do not recommend them to beginning fish keepers.