Is it the male or female that holds the fry in the mouth ?

And from the time you notice it holding the fry, how long before the parent
can no longer keep them safe in the mouth ?.

I have one that is holding fry again and I need to set up another tank
before I start to loose any. The last lot that survived (3-5 months ago)
went from 18 to now 13 fry. So, how long do you think I have to set up this
new temp tank.