Please help me identify this fish. It stays in this treestump and only let me take a picture of his face. It's about 5 inches. It's brown in color and doesn't have a very big (dorsel?) fin. So it just looks long and smooth. I can't find anything like it on websites showing common plecos. It likes to suck on the aquarium side sometimes. I know it's a sucker fish. It also it very weird about colored rocks/decoration gems. It aggressively moves them all the way to the other side of the tank in a pile, away from it's stump. It shares the 20 gallon tank with one tiger barb. The tiger barb killed the other tiger barbs and the corycats but doesn't bully the pleco. I know you can't tell much from the photo but my tank light is out and he doesn't like to come out.