this sounds bad but i dont exactly know.... i think i have a guppy the gold fish which is white/gold/black specled and a black guy with HUGE eye sockets sticken out the side of his head.. the pet store said they would all do well together
Um, right. Were you sold them all at the same time? As the guppy is tropical and the goldfish are coldwater . Also you are guarenteed to have problems if you continue with your current stock. A 10 gallon is at most big enough for just 1 goldfish I'm afraid and that is only while it's small and if you do fairly big 30 - 40% water changes every week. Once your goldfish grows a bit bigger it will soon outgrow your tank. I would suggest you get rid of both goldfish completely and go for a tropical tank. You only need a heater and a couple more guppies and you're away.
I would also advice that you read all the pinned articles at the top of this forum as they offer tonnes of useful info for beginners.