I would have to dig further to perhaps confirm the species, but I will mention that according to Planet Catfish the pleco L201 is a different species from Hypancistrus contradens. There is also a near-identical species, H. inspector; the external difference between these latter two species is the black edging to the unpaired fins in H. inspector. L201 has a higher body than the other two species. Photos of all three abound at Planet Catfish.
On the feeding, the species in Hypancistrus are carnivores, not primarily vegetarian (algae) and I have known professional pleco aquarists who say they will not usually touch veggies. Fish and shrimp-based sinking foods are needed. Shrimp pellets (Omega One make an excellent one) are ideal, along with other sinking foods that contain a preponderance of fish meal, etc. Frozen bloodworms would be ideal, and with a pipette you can aim these directly in front of the pleco. Also frozen or live shrimp, though the other fish would likely devour this quickly.
They are nocturnal, so dropping these in a bit after the lights are out and even when the room ambient light is out (so it is true "darkness") should provide the food for the pleco as the other fish will be "sleeping." Newly-acquired fish, esp pleco, often show no interest in feeding until they are settled; at least, mine always have.