I currently have a 29 gallon tank that I have 5 gold fish in.I know! Way to small! I was given three that are 6-7 inches maybe. They are all feeder fish but Two have fancy tails and the other is just a feeder fish. They are apparently 8 years old and they were in a 5 gallon barrel maybe smaller! I only had a 10gallon to put them in which they were in for about 3 months and loved it! Since then (i have no idea... maybe 4-6 months) i bought a 29 gallon. They did great for the first month then they got slow and just sat in the corner. Water was fine, everything was the same. Since my plan for them was to go into our pond i figured that i could go buy two more feeder fish and they will only be in there for a few months. My plan worked! They are as happy as could be now... So that's how i have 5. The small ones have doubled and the big ones are stunted big time but might have grown a bit more ( hard to tell when you see them everyday) Okay, so we have a pond and it has to be at least 100 gallons and we want to make it bigger and a water fall next year. The goldfish have been inside all their life ( almost 9 years and almost a year) the tank was at 76 ish but its currently sitting at 72 ( no heater) i would wait a bit more for the weather to get warmer and sitting at about what they are in now but will they die during winter? I love these fish and i don't want them to die we have had fish I'm the pond before but usually only two years because they get eaten. This year we have grates on it but if an animal really wanted them they could get one i guess. What should i do!?!? Thank you