Here is the big reason. It won't because.................. ......................... ......................... ......................... ......................... ......................... ......................... ......................... ......................... ......................... ......................... ....You want it to. Sorry, couldn't resist. You might want to scrape off some of the spores, turn off the protein skimmer for about a day or so and let them settle on your rocks if that is a possibility.
How to Grow Coralline Algae in a Saltwater Aquarium