API General cure is pretty much Metro, they have it at petsmart I believe. Not a drug I've ever used for ich but I've heard of it being used by someone once before. Not sure the outcome. Metro is usually used as a dewormer for saltwater fish.
Most would recommend removing all your fish and treating them in a seperate tank while leaving your display fish less for eight weeks. Ive treated ich many times and my treatment of choice is cupermine(copper), but it requires a seperate tank and a cycled sponge filter. I have a seeded sponge if you decide to go that route.