Do you think you could get halimeda to attach to your back wall along with something like caulerpa? Does your wall have crevices that a sprig could be wedged into? If one or two can be wedged in then eventually others will probably grow naturally there.
I think it probably likes the bright light plus you would have some variation since the halimeda is calcarous and grows in a segmented branching fashion. I just think it would look cool.
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