I keep a 300 and a 75 with gold fish. The best place to get them is out of Hawaii. I only by from steve now as his fish are superior bar none. He even has true yellow. His prices are high but the fish do not have any inbreeding issues, illnesses and they are always spectacular or he will not sell them. he has many articles to review to help you out. Simply amazing! www.raingarden.us. He has had his fish featured in Practical Fish Keeping and Tropical Fish Hobbiest I cannot say enough about buying from him as he takes his business very seriously. Most goldfish are abused and neglected and full of bacterial disease. I have never had an issues with any I have ordered from him. My favorite is the Watonai Have fun!