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If you're talking about that small brownish thing in the front left, it could be a small closed up mojano maybe. Just a guess, though, because it's kind of hard to tell.
If it is, I would say you should get rid of it. There's a lot of mixed emotion about this topic too, so you may get a number of opposing views. I have two or three of them in one tank and they've never been a problem at all. Others, however, have had some bad experiences with them. Generally speaking, they are considered a pest and should be eliminated.
I wouldn't do anything just yet, though. Wait until someone else can do a better job of confirming its identity.