Swordtails babies

I've got some swordtail babies that are about 20 days old now.
To stop them being eaten they're in the breeding trap but I'm
wondering whether I can let them out yet.They're big enough not
to fit in the mother's mouth but I've also got some bigger
Mollies and I'm sure they could eat the fry if they wanted to...

Would the fry be able to keep out the way of the Mollies? They
seem to be fairly wary (in that they swim away when I open the
lid).... Or would it be safer to keep them in the breeding trap
for a little while longer?

I've read about keeping the adults well fed to help stop them
eating the fry, but it seems to me that the Mollies are *always*
hungry!

There's a few plants in the aquarium but I haven't got any Java
Moss or that kind of thing.

Another point - at what age will the males start to grow their
sword? I've heard the presence of another male can delay the
development and help the males grow larger (apparently they
stop growing once the sword starts developing...). The only
other male is a Molly, will this have any affect?

Thanks in advance
--
Ed