It is definitely not an A. Adonis, due to the uniform, spots that fully cover the body. By the way miles L155 is Acanthicus Hystrix. A. Adonis hasn't been labeled with an L yet. I have seen these before, but can't think of the species. I will have to do some research... I'll get back to you soon.
Ok so what I came up with is the possibility of either L240 Leporacanthicus sp. aff. galaxias. Either that or L282 Pseudacanthicus sp., but it is hard to tell based on the picture. Can you post a side view picture, over head, or mouth picture. That will definitely tell me whether or not it is one of these, or A. Adonis... However based on the picture given the snout is too narrow, and the dots are too uniform to be A. Adonis.
A. Hystrix have no spots, and wide snouts. This pleco has spots, and a narrow snout. The spots are way to organized for and A. Adonis. L. gen. sp. Galaxias has the spots organized, and the narrow snout. However, it is hard to tell because there are newer species coming out all the time.