I recently inherited about three dozen fish from a friend who passed away. Among the fish were two beautiful Goldfish in a small 5 gallon tank.
I have never owned Goldfish before, but I knew they need a fairly large tank. All that I had vacant at the time was a 10 gallon tank. I figured it's not idea, but better than the 5 gallon until I can figure out what to do.
They had a couple ammonia burns when I got them. Now they are healed, fat and healthy. I put a 200GPH HOB filter on the tank that keeps the water crystal clear. PH is around 7.2, Nitrites are less than .3 mg/l, and ammonia is 0. They have a good 1" or slightly more of body. I have had them in this 10 gallon tank for about a month.
Here are my questions:
1. I realize that they cannot stay in a 10 gallon tank forever, but how much longer CAN they stay? This inheritance put a strain on my wallet so I would like to wait as long as possible (as long as is healthy) until I purchase a larger tank.
2. When I do upgrade the tank, what can I get away with? 20, 30, 40 gallon? Also, what kind and how many-if any-tank mates can they have in their new tank?