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Hi, everyone. I've been trying to decide what to put in a new tank that we got. I was told it was a 29 gallon, then thought it was 25. We measured several different times, and after doing the glass thickness too, we realize it's only 20. Anyway, I want to get a fancy goldfish. I know they need 30 gallons or bigger when they are full grown, but how quickly do they grow? A guy at Petsmart told me that I could keep two in a 20 gallon for about 5 years. I'm not sure if I believe that. I know I will need to upgrade eventually, but can someone please tell me from experience how quickly they grow so I can plan things out? I've heard that they grow a couple inches a year, but I've also heard an inch a month. We have 2 filters that add up to 50 gallons of filtration. If I get two babies, will they be okay for a while? Should I just get one? I want probably a fantail, maybe a Ryukin, but not an Oranda. Thanks!