Flame moss and marimo are both low light. In fact all mosses are low light. Main difference is flame moss grows more out then side to side. Marimo grows into more of a carpet. But marimo spreads extremely slowly.
I wasnt sure how it would work with the marimo. Thats just a moss ball like from petsmart right? How do you do that? I would hage thought it would be difficult since its round lol sorry if that sounds stupid I just got this image of a moss wall with a bunch of balls on it lol if I could figurr it out Im sure I could buy enough to just cover the whole thing instead of waiting for it to grow.