I just noticed tonight that one of two black mollies has had a bunch of fry. I've read that you should get a breeder net to separate them from the other fish, but since the only fish in there yet are the two mollies and two small neon tetras, it's a big tank (55 gal) and heavily planted, I was wondering if the net is necessary. They seem to be hanging around and among the plants instead of the open spaces, so that's good I'm guessing. Thanks.