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I have one dalmatian molly and two guppy fry in my fry tank. They are 21 a and 20 days old. Im not quite ready to move them in with the adults, they arent big enough for that! But i was wondering how big they would have to be to be completely safe? And when are they big enough to start eating other fry? I had found another fry in my QT tank, about 3 days old, and i cant find him in the tank. Though, my molly fry, beng bigger, has a bigger mouth, but i dont think they are big enough to eat him! i think it may have died, and then they ate it, but to outright catch and eat it..im just not convinced they are big enough.

I just want to feel comfortable putting any newborn fry in the tank..And if i need to find a bin for the older fry in case of any births...
 

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My guppies and mollies don`t eat the babies. Its a good thing you are keeping them in a fry tank not net or else they are small and weak as adults. I always wait until they are 1/4 of an inch.
 

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My gups eat the babies sometimes, and these are my first fry..I much like them in a seperate tank, so I can keep an eye on them, and make sure they are alive and healthy. I lost on of the Molly fry, and two of the guppy fry..
 

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I released my baby mollies when they were about 1 month or a month in a half old and they seem to be big and strong enough on there own. Hope this helps!
 

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Well, generally they are safe when they can't fit in their parents mouths. The fries are fast and under trouble they will swim away. I recommend at around 3 weeks (where you are right now) you should be safe to move them. Just make sure you cover the filter just in case.

If you have any larger fish in the tank, you may want to wait a bit longer.
 
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