I currently have a 47 gallon fishtank that houses two goldfish.
The white one is a comet named Veto. He is about 7-8 inches long including the tail, and I got him almost seven years ago when my biology teacher had us do an experiment. When I first got him, he was less than two inches long, and mostly gold with a few black markings. I originally had him in a ten gallon tank, but he quickly got big enough that he needed more space. When he was little, he got stuck in a plastic tube, which we had to break to get him out. He also once got a piece of the aquarium gravel stuck in his mouth. We had to put him in a bowl, hold him down, and use tweezers to get it out so he could eat again.
The gold one is a common goldfish named Bois (It's french for wood, and is pronounced Bwaaah.) He is around 5-6 inches long, and I got him about a year and a half ago, after Veto's previous companion Navi went to fishy heaven. Bois was kept in the koi tank at the shop where I bought him, so he's very skilled at grabbing up pieces of food quickly. He was a bit sick last week, but he's made an amazing comeback, and is making a full recovery.