Panaque species (royal plecos ) require driftwood as stated. I'd do a couple different types just to make sure he likes one of them. They poop alot and can't handle protein in their diet so keep it mostly veggies and the wood. They grow painfully slow (like 1" a year) so if you are looking for an exciting fish panaques aren't the answer. That being said they are awesome fish. Wait for a bigger tank though.