Maybe you can tell me what this kind of pleco really likes to eat.
I can't, plecs don't talk. I can tell you that they are herbivores primarily and should be fed mostly veggie/algae based stuff, but plecs, like humans, can be individuals and may like to eat different things than other individuals.
L144 should only be fed a little bit of meaty/meat-based stuff. Chances are if you feed the incorrect food to them they'll eat it but then problems can result. For instance, herbivores that get too much animal based proteins can get bloating & digestive distress that in bad cases can result in death. Therefore its important to understand the dietary requirements of the plecs you keep so you may offer them the correct foods.
Being primarily herbivores, L144 should be fed mostly veggie-based stuff including fresh vegetables, and veggie based foods. A word of warning, many "algae" foods contain little if any veggie/algae matter. When purchasing foods, make it a point to look at the ingredients and see where veggies/algae falls in the list. Also, don't confuse grain products with veggie matter.