yes like i sead 1 balloon belly molly it is a 10 gallon if you do not know what that is just google it and i do not know what my water is
While you "said" that you already had a molly, were you planning on having any other fish in the tank?
Knowing whether your water is hard or soft is something that is important in this situation considering that the only algae eater available for your tank size are snails. Shrimp could live in a 10 gallon but they are sensitive and your molly would most likely pick at them. Snails prefer harder water to keep their shells in good shape. If you have soft water, then you would have to provide other stuff for your tank to help keep the snails' shells in good shape.
As for the 10 gallon tank question -- there are lots of different tanks out on the market today so just telling someone to google "10 gallon tank" is not a good answer when someone asks for the dimensions. If you have a standard 10 gallon that can be picked up at say a place like Walmart all you have to say is a standard rectangular 10 gallon glass tank.