In the photo in post #25, the plant on the right on the swirly pattern is Java fern windelov, which needs to be on decor.
The two leaves on the left can't be used - but the one next to the swirly pattern has a baby plant growing on the top. I would leave that floating in the water till the baby plant grows roots, then carefully detach it and attach it to decor.
The java fern's rhizome is what needs to be glued to the decor, but it looks like it has roots twisted round it. If you could loosen those a bit without damaging anything, you may be able to free the rhizome. If not, just glue the root mass down.