05-14-2009, 06:24 PM
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coraline can come in all different colors, from purple to pinks and yellows and oranges. purple is the most common i see. i have some orange in my tank and i think alittle yellow but not much. if its hard and encrusts its more likely coraline. if its hairy, furry, soft.. its something else.
IMO purple up is an overpriced alk suppliment however i do not have experience with this product. keeping good alk, mag and cal levels are important for coraline, coral, and even fish health. you can test these levels with a good liquid test kit and dose accordingly.