My first pleco was sold to me as a Vampire pleco, L007, was about 4" long and I paid $40 for it. That was 5 years ago. That L007 turned out to be an L240 (which I still own), along with 3 others that I am still trying to breed. From your pics, it could be either fish. You need to get a good shot from above the head, and if possible, a picture of it's mouth. Good luck.