snails aquarium plants

I'm new to plants, (other than moss/moss balls) and I am adding a java fern and an Anubis (which comes pre rooted to a piece of driftwood,) and java moss and wanted some advice on how to make sure the plants thrive I a new environment, and how to get the java fern to root in my gravel substrate...

Last weekend I visited my LFS and purchased 6 Lemon Tetras and a Java Fern growing on a piece of bogwood. I first placed the plant, then the fish, into the aquarium. They looked absolutely lovely... Or so I thought...   A couple of hours later I noticed something small, not much smaller than a...