I use to keep goldfish in my younger days and since then I have only been keeping bettas and a livebearer tank. I would like to set up a tank for a goldy I had a spare 15gal tank lying around and I was wondering if this could house some type of goldie if so what type? I was also wondering if I put a snail in the tank if that would help wastes if not no big deal. I also would like to know if goldfish like oranges? I always see orange slices at my petstores. I got a filter on it that is double the capacity of the tank and I can do water changes as often as I need to any help would be great thanks.