Coralline algae is surprisingly easy to grow, and if taken good care of, can grow relatively fast. How? Well, let’s look at the things that really effect coralline algae growth.
Second, if you do have some coralline algae, try taking a new, washed, firm toothbrush, and gently scrape the algae until a light dusting of it come off. Supposedly, this encourages the spread and colonization of coralline algae spore. If your tank is currently running ozone or UV sterilization, turn it off for a while, as you may be hindering this spread and colonization of coralline algae spore.