The 'Golden Nugget Pleco' (Baryancistrus sp) is still not properly classified yet and so its' taxonomy may well change. They come from the Amazon Basin so I would be advising that you use peacefull fish from that region. Neon Tetra (Paracheirodon innesi) or Cardinal Tetra (P. axelrodi) Angelfish (Pterophylum sp.) and any number of other peacefull fish from that area. Please remember though that fish from the Amazon Basin do much better if they are given water that is slightly acid around pH6, low hardness below 10degrees, around 80F and very regular water changes