u can try to keep the mollies
coz shops wont pay u for it
and some shops will just take them and neglect them
i dont know bout some ppl but my baby mollies are growing
u must have lots of plants for them
and i did not seperate them from the adults since birth
however, if u have seperated them edi, do not mix them again
if u mix them now, most probably the adults will just eat them
u can try selling to the shops when they are big
but it will be easier if u know them (ur regular LFS)
i tried keeping them in a small aquarium but failed
the ur 10 gallon should be no problem
u can feed them the SERA powdered food
im currently keeping my mollies in a 10 gallon tank
its quite successful
so u can also give it a try