Gold Nugget Belly? Look healthy?

That pleco looks hungry... Try offering a few algae wafers once or twice a wk.

All algae eating fish will require supplemental feeding. They don't just eat the algae that grows in the tank.

The stomach looks ok to me. Gold nuggets are not algae eaters, they eat both plants and meaty foods. I feed mine the tablets that cories get. I also feed it shrimp pellets.

Actually, the stomach does not look to bad to me, but they are omnivores who need protein such as blood worms, mysis and brine shrimp (preferably frozen like the 50/50 Plus defrosted so it sinks). I have found if you feed just after the lights go out, the little guy has a better chance at getting the food. Also, Hikari makes "Sinking Carnivore Pellets". Having drift wood in your tank will really help as they love to chew on the wood and make it a home.

Good luck