My tank is about a year now. On the first pic, theres like 2 diferent but not diferent kinds of zoos. Green centered brown skirt, darker green to brownish center with bright green skirts. The "unknown zoos" have started to come out more, they have a green skirt, and so far an orange center. My gsp rock has alot of purple mat, but so far only 5 polyps Should I worry?