Do you know how much it is usually worth? and can you give me a lil bit more specific information. I just tried to google "Gibbiceps" and it showed me a lot types of pleco.
I got two in my 180. not quite 12in but probably about 10in. I said not a gibby cuz the pattern on the body of the OP's pic dosnt look like a gibby to me.
Mine was sold as a sailfin with no scientific name stated. It was implied that it was a gibby, but after research I found it was not. They are very beautiful fish compared to common's and from my understanding a bit of a smaller size pleco at full growth at around 12".