why do goldfish make bubbles at the top of the tank and there white
This is not normal. What size is the tank? What type of goldfish/how many? Is it cycled? What are your numbers for ammonia, nitrite, nitrate & ph? What are you using as a water conditioner? Are you adding any other chemicals/products? Do you have filtration & extra source of aeration? The more info you can provide, the better we will be able to help!
Fantail goldfish its a 10 gallon tank