I have a 90 gallon that I got 2nd-hand complete with 3 gigantic java ferns
and some amazon sword.

I've been reading that java moss looks pretty on logs, and I was thinking of
adding some. But many LFS (Toronto/Mississauga - Canada) don't stock it,
and one even suggested that it's a pest and pernicious weed. Should I be
rethinking my desire to introduce java moss?

Gerry