How healthy is for siblings to breed??

Hello everyone!
It's been so long for me, but here I am! I have some pictures to post regarding one of my Mollies (white scales all over her face area, what it look like ick on her tail) but right now I have another issue(concern). On and on I had many fishes but the ones that I have to bow to are my Mollies, that been said I have a pair of (adults) mollies bought at the pet store and 8 (3+ month or so). *Just to know at what time are they consider adult? Out of those 8, one is a survivor (which I can't recognize out of the other 7) and the rest are from two different batches from the adult pair (4 the first batch, 3 the second batch) The think is I want to know, when they can start breeding? They are siblings, would that affect the outcome? I have no other place (tank) to place them and I wonder how can I transfer them to another place since my sister is interested and I know they will fill my tank!! My biggest concern comes to my attention now because out of the 8 I can tell already two are males and one of the females looks PREGNANT!!!!!!????? Please as always give me some light/info as soon as I can I will post pics of them too! Thanks!

 

Being a biologist, I can assure you that having siblings breed will not create any issues.
Many fancy livebearer strains as well as fish like EBJD, were created by doing this very thing.

Genetic issues do arise from inbreeding after 4 or more generations of breeding within a closed stock ( no new unrelated genes). But that is not the case here.

Most livebeaers are considered adult once they are able to breed. This can be anywhere from 30 days ( endlers) to 2 years ( Montezuma swordtails).
Most mollies ( aside from sailfins) I have dealt with were adult by 2 months of age.

 

I think once you get beyond 7 generations of close inbreeding you start to have problems. Many breeders obtain desirable traits by breeding siblings together or parents with offspring.

Livebearers are breeding machines! For mollies, right about 2 months sounds about right. I haven't noticed any of my month old Endlers breeding at 30 days, but it wouldn't surprise me!

 

I should clarify, male enders are able to fertilize at 30 days.

 

Lol, I think they try from day one Livebearers are great!

 

What is the temperature of your tank? If you think you are having an ich breakout in the tank you should raise the temperature to around 85 degrees. Don’t use any medications for ich just raise the temperature and keep it there for at least two weeks and the ich will go away on it’s own.

I keep my Molly tanks at 80 to 82 degrees all the time and with at least 3 table spoons of sea salt per 5 gallons of water. This helps keep them free of diseases and helps fry grow quicker.