To grow coralline algae in a tank that does not already have any coralline in it, go out and buy Calcium, Strontium/Molybdenum, and Coral Vital. It's my opinion that Kent makes the best Calcium and Strontium/Molybdenum, but for your Coral Vital, get Marc Weiss' product. It is much better than the Kent product. Although it is $10 more, it is worth it.
Dose the Coral Vital every day for the first month, while dosing the Calcium and Strontium/Molybdenum every week.
Within a month or two you should see coralline starting to grow very well.