First attempt @ Planting a Tank

[aarongalvan]

Here's my question...

I have a Breeder tank that I use for when my Mollies are prego. I have two in there now, and 5 or 6 fry; I want to add some Java Fern, and something tall.

That was a statement; now here's the question can I add Java Fern, or do I have to plant a tank before the fish are in it?

I won't put in any driftwood because I know Mollies like slightly hard water. I plan on stuffing some Java Moss into a few large seashells and putting some nylon mesh over them and see what happens!

Ideas, Comments, Corrections, Solutions, Problems?