Even a fake palm leaf would help them. A couple sticks maybe. They like to walk up high from place to place. You can look at my agalychnis annae 10 gal to get an idea of a jungle. It's pretty crowded, but that's what they like. Lots of cover.

Make a plan and do it all at once, changing a little every couple days stresses them out
I say turn that viv on it's end and get a conversion kit online or make your own. There's my home conversion in my alblum too. If you do this you have to wait 48 hours to put them back in. The silicone has to cure.

Good luck!