I just found somethen in my tank. I really dont know what it is. I know eats alge.(i think) I would take a pic of it but camara sucks. Well it looks like a snail. But little longer. Has a oval looking shell that its snug to it body. And only on the front half of it body. Hads two feelers up front ( i think). Movement is like a snail but faster. And its able to stand on its tail end.

Please tell me if this is keeper or a trasher..
thanks urban