So i have a 20 gallon fish tank with a couple of fish. I have 3 skirt tetras, one sarpae tetra and a goldfish. i also have two african dwarf frogs. I know the goldfish is not good to be with those because it likes cold water and it might eat the frogs, but i plan to move it to another aquarium as soon as i buy gravel and other supplies with an tank i have. I was wondering if i should buy more fish, or if those fish are enough. If so, which ones should i think of getting. Give me a couple because the variety of fish at my local pet store isn't very wide.