Replacement for tree fern

[Matts inverts]

I wanted to make a small terrarium and I don’t like peat moss. I was wondering if western sword fern roots would be the same as tree fern root fiber. I think the plant is nontoxic to animals and I was wondering if it could replace tree fern fiber. Is there any way to test it?

 

[Matts inverts]

I know it’s not the same but they are both ferns and might have the same root systems