Looks to be a Sail Fin or Common Pleco at full zoom, on my phone. Where did you purchase and how much? If $3-4 I would say, yes it's a common. They get big, 12-22 inches big. Their main care needs are :
-A tank of at least 100 gallons.
-Drift Wood to help with digestion
-Good hiding places, big enough to fit in, and be out of the light(during lights on).
-a good source of algae(looks like you've got some) and supplement of algae wafers. They also enjoy fresh veggies, zucchini being a favorite. They do enjoy the occasional protein treat such as freeze dried worms or shrimp.
Hope this helps!