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We purchased a small 5 gallon tank for my 6 yr/old daughter at Christmas and we got 3 fantail goldfish initially. I have to admit to not doing any research ahead of time and was unaware of the size tank needed, etc. After seeing the tank get very filthy and the fish acting lethargic, I upgraded to a 10 gallon tank about 2 months ago. The fish have done much better but I'm surprised how dirty the tank still gets. I have been doing 25% water changes every 2-3 days but finally figured I need to upgrade the size again. I'm thinking of a 20 gallon tank since I have a 20g filter right now. My other option would be a 29g but I would need to get a new filter in that case. I can't seem to make up my mind on this but can see the advantage of just getting the bigger tank. We don't plan to be adding any more fish. Once I get this new tank, it sounds as if I could just move all the existing gravel over to preserve the bacteria? I would also be able to use the same filter if I go with a 20g which would help maintain the cycle. The plastic plants have brown (algae?) all over them so I am not sure if they should be moved or not. The current tank seems fully cycled with hardly any Nitrates/Nitrites or ammonia. I guess I'm just seeing if anyone has further advice on tank size and how to go about transferring stuff over. Thanks!!