I know nothing about fish tanks, but have wanted a fish tank for a while. I just bought a 55-gallon corner tank today through the classifieds. I believe it was used as a saltwater tank. The back corner of the tank is sectioned off (overflow?), and there are two holes in the bottom of the tank in that section. There was also a Amiracle filtration system included, a hose, two plastic nut and bolt looking things and a bunch of other stuff. Can I use this tank as a freshwater tank? What do I do about the holes? I'm kind of scared to start filling this tank until I know more about the holes, and whether this sounds normal or not. I appreciate any help.