answer:I am not incredibly familiar with salt water fish, but from what I’ve been told they need way more water than freshwater fish (which I am incredibly familiar with). This site (linked at the bottom) says 30 gallons minimum and that is pretty on par with what I’ve heard. Also keep in mind you need to account for the anemone in the tank, it will reduce the actual amount of water available. For your best answer, I would ask the person selling you the fish, assuming it’s a reputable store and not like Petco. http://www.fishlore.com/profile-maroonclownfish.htm