[dawntwister]

I'm looking for some taller java fern to fill in part of the background.

You need the java fern v needle leaf. Shame you aren't near me for I have some I could spare.

Your java fern look like they need some flourish excel or hydro peroxide and Calcium sulfide.

Are you in Canada? Where are you in Canada?

These 2 are in Canada:
Rusalka Toronto, ON, Canada
Sunstar Burlington, ON, Canada