I really like the JBL Novo PlecoChips. They're specifically designed for plecos with high veggie diet requirements and also contain 10% wood fibre for those that need wood in their diets. There's speculation that Ancistrus species do require wood, but I don't think it's been confirmed. They don't disintegrate in the tank, so you can chuck them in when you turn the lights out and they won't dissolve before your plecos come out for dinner. All of my guys, Commons, Bristlenoses and my Clowns love them.