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A goldfish can grow to 12 inches or so. Using the basic rules of fishkeeping which are :- 1 inch of fish needs a minimum of 1 gallon of water. :- Every tank needs a permanently running cycled filter. :- Every tank needs a minimum of 50% of its water replaced every week. It is obvious that a 10 gal tank is not large enough for even one fully grown goldfish. You could put a few small ones in the tank but keep an eye on their sizes and do not go over the 1 inch per gallon rule, otherwise you will have constant sickness/health problems with the fish caused by overstocking.


Actually it depends on how big they are if you have a baby goldfish, then you could put around five, but would need to buy a bigger tank later on. ( if they dont die ) If you have fully grown goldfish, then maybe around 2-3. Usually the tank size doesnt harm them. What happenes is that if the tank is too small, then they wont grow and they will probably die. And if one becomes pregnant, then they will have no room to lay the eggs or they wont have enough room to swim while being chases by other goldfish. Hope this helps!
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7y ago

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