I was at Walmart today getting food for my cats and happened to walk past the fish. A little gold fish caught my eye and his tail fin was completely ripped off. Nothing but a nub. I don't own a tank but my heart goes out for the little guy. I want to buy a tank and get him out, but that are his prospects of living? I have a little knowledge about fish, like gold fish produce a lot of waste so they need large tanks. But how long will the water need to cycle before it's safe to put him in? He's a very little common gold fish, will a 10 gal tank be enough?