yes, they will probably do good with goldies; although the rubbernose is the only (real) algae eater although the scobiancistrus (gold nugget) will eat some algae he is still a very cool fish. Although I encourage branching out and getting the rarer varieties so don't feel confined to just getting algae eaters
on the L191 (panaque) he may eat algae from time to time, but not as much as a L165? clown plec, I have recently bought one from petco which are gregarious plecs, which are somewhat good of algae eaters. These all require bogwood it is MANDATORY, which helps aid their digestion.
Just uot of curiosity did you find these at a commercial pet store? (i.e. petco petsmart etc.)or just a small local buisness?-hope this helps.