This linguistic confusion is why Americans call the Pennsylvania Dutch Dutch even though they're Germans. To review: this country is the Netherlands, its people are Dutch, they speak Dutch. There is no country called Holland, but there are provinces of North and South Holland.
In clean, uncrowded conditions in tanks or ponds, goldfish grow fast. They can grow to a few inches (1 to 4 inches) within the first year. It really depends on their genetics and living situation. It may take a year or two before they change color from brown to gold or whatever color their parents were.
Tips for a healthy goldfish diet: 1  Feed your goldfish once a day. Don't worry about starving your fish. All he needs is what it can eat in 2 minutes. 2  Feed your goldfish fruit and veggies regularly (every 2 days) 3  Make sure that all hard vegetables like carrots, beans, rice are cooked, pealed and finely chopped up.