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Hi I have a 10 gallon fish tank. In it i have 6 balloon belly mollies they are all quite young. Their mother lives in our bigger 56 gallon tank. She had 21 babies and now we own 12. In my tank I have one boy and 5 girls. The one male has been chasign the other females around and sometimes makes his fins rather big. I have a couple questions. One How old does a fish have to be to get pregnant? Do they breed wtih family? And how do you know when one of your fish is preganant? I will try and post pictures soon. I am new to this fish breeding stuff. Please help me out here thanks!:-D
 

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4 months of age is what i was told when i had a similar question a while back. being that you have a 1:4 male/female ratio i woulndt worry much about the male harassing the females too much, that is a good ratio to have. Unlike cats, dogs ect. i dont think it is a problem for fish to breed with siblings, i know with bettas they actually recomend it.
 

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all males livebearers that want the girls....flush up all there fins trying to make them selfes either look bigger or more apealing to the girls....this is normal behavior :):):)
 
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If they are pretty young still, sometimes their babies are unhealthy and die or they have a very small amount like 2-5 maybe? Also I heard pregnancies too young can stunt the females growth i think... not sure though! I'm sure they'll be fine! Also if fish breed too many generations together than I think they can be born with defects. I think one generation will be fine, though. Not sure how to tell when balloon mollies are pregnant... other than if they act funny/hide/not eat and the back of their stomach looks pushed out in a spot.
 
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when she starts to get a little bit more fatter you might know she is pregnant.
 

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Discussion Starter #8
So how will i know the difference between her growing like growing from age because they were born last july and still are not the regular size yet or from her actually growing from being prego?
 

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Her stomach will grow, not her body.
 
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