[Edit] 
It depends on whether it is an aggresive fish but there is a chance that it will kill it.
Answer
Daniel.. Goldfish do NOT cannabalize each other, so there is no risk of the fish killing the younger one UNLESS they are bubble eyes. I would not keep small bubble-eye goldfish in with larger goldfish of any kind as their bubbles are VERY delicate.
Answer
NO! You can't put a baby goldfish in the same tank until the baby goldfish is at least 3 months!
First answer by daniel. Last edit by Vivian Sing. Contributor trust: 28 [recommend contributor]. Question popularity: 81 [recommend question]
Answers.com > Wiki Answers > Categories > Animal Life > Pets > Fish and Aquariums > Goldfish > Can you put a baby goldfish in the same tank as a big goldfish?
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