My plecos like zuchini stuffed with pellets (massivore, sinking carnivore, NLS, shrimp pellets, etc etc). I have carnivorous plecos though...be careful about feeding too much protein to omni/herbivores..
It might take a few feedings for it to realize its food. I take out whatever is left over after about 12-24 hours. To prepare, I just rinse it.