i really wanted to name my post HELP because i am very confused. i inherited a 5 gal fishtank that had originally 6 fish, which i dont know but maybe someone can help me zero in on their species.apparently 1 is supposed to be some sort of "shark" my sister was into that kind of stuff the second...

Hello I recently acquired a 55gallon Tropical Freshwater fish tank. It already had in it 2 silverdollars and 1 other fish that I just cannot remember his name he is black and orange and about 3 inches long. He is not a chiclid or a Barb and Petsmart told me he would only get about 6 inches. We...