Nice find! Pseudohemiodon spp.; so rather similar to apithanos.
You'll ideally want a fine sandy substrate to allow the fish to burrow and sift; I would consider sand to be the most crucial aspect of furnishing their tank, and have kept them in tanks with nothing but a 2" layer of it- all else can pretty much be ignored, furniture-wise. Larger pebbles not only prove uncomfortable for the fish, but also seems to increase the risk of bacterial infection.
Pseudohemiodon, and most other larger 'whiptails' (Rhadinoloricaria, Spatuloricaria, Crossoloricaria, Paraloricaria, etc.) require absolutely pristine water for long-term maintenance, along with very high DO and warmer temperatures.
They are also inefficient feeders- choosing to pounce on a food item and spending the next minute or so mouthing it before moving onto the next. I have had several problems trying to feed them in a community tank, and only recommend that they be kept in species-only tanks.
Not a fish for the inexperienced- they may survive for a few months, but oftentimes invariably perish with poor care.