I have one myself - as they are wild imported you need to ask your LFS how long they have been there and if the water conditions are similar to yours otherwise you run the risk of trying to acclimate them. Thankfully mine had been there for around 6 months and was very much used to my hard water.
One is the best number to have and they are omnivores probably leaning more towards the meaty side of things. Your tank needs to be at minimum 6 months or older as they feed on the biofilm around the tank - obviously this isn't enough to sustain them so bloodworms seem to be a favourite for mine. That and New Era Plec Pellets.
They are mostly nocturnal - I am lucky to see mine out during feeding time. That and he has a 'hiding' spot that he thinks I can't see him but in fact he is in clear view so if you want a friendly plec then you'll be disappointed as they are very shy
Beautiful though.
Also very sensitive to nitrates.. I would highly recommend leaving your tank longer to mature. They aren't cheap.