it is just P. aurantiacus also known as a chubby pleco. They are known to be able to change colors between gold and grey sometimes being a patchwork of both. Great find though
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They dont have an L number. And as said above, they change color. By the accounts I have read, there is no method to the madness of them changing their color either. They aren't like Luteus or L014 where they change over time to a permanent color. I have heard of people spending a bunch of money on pure yellow ones, only to have them loose most of it, and vise versa.