Now, I know that fancy goldfish need 20 to 30 gallons to thrive. Unfortunately I didn't know that when I bought my goldfish several years ago. I've only recently began to read up on goldfish and their needs and, to my surprise, 10 gallons is not a generous amount of space for a goldfish. I found an old 15 gallon tank in my basement and I'm about to move him over there. I know this still isn't enough, but it's the best I can provide for now. I'm in the process of getting a better paying job, and when I do I'll be able to afford a new tank, but that probably won't be for a few more months. Once I put my goldie in his new 15 gallon, what can I do to give him the best life possible? (Until, obviously, I get him a bigger tank). As far as food, plants, decorations, and tankmates go, how do I make him as happy as possible? This is the setup he's going into And this is him I believe he's a ryukin, and he's about 3 inches long not including his tail. Tail included, he's probably about 6.