Boxman we like them as well. Our little guy is still getting used to his other tankmates and the nooks and crannys to hide in, but he already has a foot long piece of bogwood.
In order for Baryancistrus (including gold nuggets) to grow, they need quite a bit of greenery in their diet as well. Cucumber, zucchini, frozen peas etc should be offered, along with the meaty foods.