There're around 6000 red varieties. I have some of the gracilaria genus, not sure of the species, if you're interested in that.
For anyone else looking for macro algae, I have caulerpa sertularioides (very similar to C. taxifolia), C. mexicana, C. prolifera, Halimeda opuntia, Rhipocephalus phoenix (christmas tree), Udotea flabellum (Mermaid's fan), Penicillus capitatus (pencil cap), P. dumetosus (shaving brush), and a species of codium I don't have the ID of (a short bushy variety).
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