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They just have them in the tank they are put in. You choose. If the conditions don't suit the female, she can hold on to her fry and stop them from comming out, and she can even choose to die rather than let her fry be born into what she considers to be a bad place. To avoid this happening you need to know and stick to the rules of fishkeeping. The rules are. :- 1 inch of fish needs at least 1 gallon of water but more is better. :- Every tank needs a permanently running cycled filter. :- Every tank needs at least 50% of its water replaced every week. Stick to those rules and you stand a chance of keeping fish successfully. Miss out on any of them, and I can guarantee that your fish will have constant health problems.

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15y ago

What else can I help you with?