Sara Jane Hales 
Fungus grows on fish due to less than ideal conditions in the water and is the most commonly seen disorder in fish. It is seen as cotton-like growths on the gills, mouth, and face. Fungal infections tend to appear because the fish has broken skin or a primary disease such as a parasite or bacteria. … Read more
Goldfish shouldn’t spend long periods sitting at the bottom of their tank. If they are, it may be the sign of a problem.
What are the physical differences between male and female goldfish? And how do they behave when spawning?
Do goldfish eat snails? Find out how you can safely add snails to your goldfish tank.
What is ammonia? Why is it bad? And what you can do about it.
Find out how much and how often you should feed your goldfish
Technically goldfish are edible… but you wouldn’t want to go there!