Goldfish are a temperate fish which are found in cool streams, ponds and lakes throughout Asia and part of Eastern Europe. If you have Goldfish in your aquarium, then you should watch this YouTube video. This video shares opinion about what goldfish stocking guidelines should be. Generally, Goldfish are big fish, and big waste producers; therefore you should remain bit careful about them. These fish are not at all suitable for the small "starter kit" tanks or bowls. Watch this video to learn some basic care tips of Goldfish.
https://youtu.be/o94YZZLJkRM