So it's been two weeks since I bought a goldfish for our new year. He's a little lion head and he lives in a 25 gallon by himself. Such a cutie too!
I know that each fancy goldfish needs at least 20 gallons, and each extra goldfish needs an extra 10. Is this because of sizing issues or filtering or what?
I'd love to be able to get him a goldfish buddy, but since I can't go any higher than 25 I have atm he'll be best off alone, right?