That's a nice looking fish rightt derrr! (red neck voice). Any idea of what the most ideal parameters are for that fish? Are you looking to breed? I was searching.. and found another cool photo of them..
https://pbs.twimg.com/media/Cq5ClICWYAEyLJ3.jpg:large
link source: https://plecostomus.org ...

It looks like a really sick common pleco to me.

Tell me what you are feeding it right now? That is common for them to "fade" if they are slowly lacking nutrition or food.

How sure are you that it is a Pseudolithoxus anthrax..?

So you said they were uncommon but now they aren't? Where did get him?

Ooops! Just read the thread that says "REad this before asking!" haha

http://www.planetcatfish.com/common/spe ... cies_id=88

It looks a lot like my basic Pleco.. what is the difference between the Pterygoplichthys and the Plecostomous and what is so different about them..?
http://plecostomus.org/ or http://en.wikipedia.org/wiki/Pterygoplichthys
I'm sure this is a rookie thing to ask but .. sorry.