IMO they need driftwood. Ive kept a gold nugget before, and a peppermint. I had them for about a month each and then they died. I was feeding them wafers, cucumber, squash. Both died and I did a little more research and found they would like some wood. I added a huge piece of wood to my tank and let it get settled. I added another gold nugget and fed it the same way, its been doing great for about 9 months now. So it could either be the wood or maybe I got a crappy gold nugget. They were all from the same store.