Fancy Goldfish tank size?

 
Fancy Goldfish tank size?
hi :)

i'm planning on getting 4-5 fancy goldfish and i was wondering what size tanks i should be looking at because i know they grow to be big fish

thanks <3
answer:
For 4 fancy goldfish you will need at least 50 gallons, 60 gallons for 5, with filtration rated for twice the tank volume.

(The general rule for fancy goldies is 20 gallons for first, 10 for each addition and filter rated for twice the tank size)
I agree with Nex- i know it sounds a bit excessive, but goldfish really do grow very big and do produce a lot of waste, so a big strongly filtered tank is definitely a must :) .
you will need a tank thats at least 50 or 60 gallons for that many fancy goldfish.
65liter or bigger my 3 fancy goldfish live in a 65l tank and they have plenty space