fiji blue, when coraline algae dies, doesn't it turn white?
and as for orange algae, i have some spots that look deep maroone unde 14,00k lighting, but under full actinic they qare neon bright orange.
i dont know about the disease, but i have had this bright neon orange one for a littl while, and am growing it pretty nicely, if i ever growi t to quarter size, i will post a pic.