Sounds like they will settle down
If the cocoa fiber is not siliconed to the back or side glass...just yank it !!!!
They don't need it, they might get hurt, you can see them better, and they love to climb on the glass
It will be thier favorite place to poop. hahahah
If after pulling it off..... leave the stuck parts....moss will grow.

As for the pairing off.... I would move them now if you see that they are interesed.
Then....things may really move along.
You may notice the male chasing another male.
Nab the chubby one and one you have whitinessed calling.
They will do the rest... lol

Most of my tanks have NO backgrounds.
I which I could throw a photo up ...but photos are broken, for the most part--- go to 'Frogforum'
facebook or to my facebook link for lots of photos.
As for learning more..... simply ……keep reading.