I have a 10 gallon betta tank and 2 weeks ago I went to my local aquarium store to get a small pleco to add to the tank. I told the worker that I could NOT have a common pleco because I know it would get too large (I was thinking clown or bristlenose). She agreed and she retrieved a pleco from a tank marked "medium plecos." I have a suspicion that it is still a common pleco but I'm not sure. Help? I only have 1 photo because he is so skittish. This is the first time I ever saw him in the tank with the light on.