I went to the LFS earlier today to get some food for my convict pair and decided to look around at other fishes and I couldn't resist buying a Ryukin and Oranda. So i brought them home and set them up in a 20 gallon. I then started doing some research and a lot of people are saying I need 20 gallons of water for the first fancy goldfish then 10 gallons for every other goldfish after that. So should I go out and get a bigger tank? My 20 gallon is filtered by an AC 110 and AC 20 which I think should be enough......