Black Moor Goldfish grow to about 4 inches?

[UP UP AND GUPPY]

Is this true, do the really only get to 4"? If so can I have about 3 or 4 in a 20g? Or would only 2 be suitable for aa 20g?

I love Black Moor Goldfish *GOLDFISH*

 

[UP UP AND GUPPY]

Also why do their eyes pop?

 

[Seleya]

Moors get to be at least twice that size with proper care - 8"+. I wouldn't put more than 2 moors in a 20 and that would be a squeeze imo -- you'll need to be faithful about maintenance. Is this a 20 long or regular 20? Their eyes 'pop' because they're bred that way.