I’ve got one of my 180’s with lyonsi and melanura planted very heavily with pogostemon stellatus octopus and they don’t pay any mind or eat the plants.
I agree with this, although you could be OK with the lyonsi , and and Dat. The Oscar "may " not destroy java fern, but will probably eat or destroy the Val,
For Toni's 1 year birthday I got her a giant Amazonian mother plant, and some Java ferns. Over the next month and half she ripped of leaves till nothing was left.
See how much smaller the plant is in the video, it's from her tearing off the leaves.