Yeah that's a Chinese algae eater. They work well for me. I agree with troyd, more caves will do the tank good. Also soon as you can tell I'd stick with one male demasoni to 5 or 6 females. And in that size I wouldn't go for anymore than 1 male.
Thanks a lot, one last thing. I have this algae eater. Do yo know its name? Can you recognize? Attachment 233985
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Chinese algae eaters are great. I have a golden one. They are classified as a type of shark by some people. They are aggressive. I have heard some people say they will kill other fish, but I have NEVER seen that with this one, or my previous one.
I guess if they got hungry enough they might, but they are pretty easy to keep happy.