My Fish - Do you think this setup is OK?

Those fish can get up to 10" long. If fish are kept in a small tank they will stay small, but their organs will continue to grow. Thus causing the fish to die. And goldfish grow rather quickly. They need a 50g tank MINIMUM. And in a 50g they'd still probably do best with a 100g filter. Goldfish produce lots and lots and lots of waste.