one thing I forgot to mention: Not all Mollies can handle Salt. I have had best luck with sunset, sail fin, black, white, and any combo of either...Platys are not salty by any means and sometimes they will breed with mollies and pet stores will sell them as either....the hybrids dont last much after 1.005 lol..I think when i first started trying mollies I spent more on them than my actual fish. (not that mollies aren't fish).
Babies get sucked up by my return pump and pulverized, which was unavoidable...thus being a constant auto feeder...They do not eat any type of corals...but dont drop a small zoa polyp or anything like that on accident...they dive bomb it and croak.
I suppose if you hae time to catch the babies as you see them than you could put them in a grow out where they cant become pump food.