Royal plecos are great if you have the tank space. They are basically a giant version of a clown (Panaque (Panaqolus) maccus) or tiger pleco (Panaque (Panaqolus) sp. L002). So largely vegetarian plecos that also require wood in their diet. Only feed them very small quantites of meaty foods (i.e. bloodworms, shrimps, or any commercial food with a high protein content) as their digestive system isn't designed for a high protein diet and they may die from it. Some online info reports they are slow growers. I found with a good diet and in a large healthy tank they can grow reasonably fast, i.e to largely full grown in 3 or 4 years. They can be stroppy as adults, particularly towards other royals. Suitable tank mates would be other largely vegetarian plecos. They may be fine with their smaller cousins, eg. clown plecos, tiger plecos, flash plecos) but I'd go for other larger species, say a green phantom if you want another fancy pleco, or possibly a Baryancistrus (eg. gold nugget or snowball). Rember they will grow large so dont overstock your tank with other big plecos.