Goldfish At The Top Of The Tank
For a properly stocked goldfish tank, a weekly water change of 25-30% is a great baseline. If your tank is slightly overstocked or you're dealing with high nitrates, you may need to do two smaller changes per week.

7 Reasons Your Goldfish Is Always Swimming at the Top

Goldfish thrive in cooler water , typically between 65 to 75°F (18-24°C). When the water gets too warm, it can cause the oxygen levels to decrease, forcing your fish to rise to the surface to breathe.
Goldfish can get stressed for a variety of reasons, including aggressive tank mates, improper diet, poor water conditions, too cold or too hot waters , too intense lights, etc. All these problems will create a variety of other symptoms and health issues along the way.
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