size

[Magiccarp]

how big will a Ryukin goldfish get in 200 gallons

 

[Noto]

The same size it would in any other tank- about 6-8", not including tail fin.

 

[Lupin]

Noto is correct. 6-8 inches is the norm although 10 inches is not surprising and unheard of. Any photos of your fish? I am always fascinated by any goldfish photos. What other goldies do you have? Ryukins are feisty little bugs.