We kept Akysis Vespa.
Not really difficult. They were an average bottom feeding catfish food wise, so not terribly picky.
The issue with the Vespas is that they have venomous spines, and sometimes would hang out in the plant matter near the top of the aquarium; do there were a few stingings accidentally when clearing out space to feed or doing a water change.
They also bury themselves in the substrate, so another place to be careful.