First off----Nikki, behave yourself!!!
Secondly----Darrell, Hakunna Mattatta (it means no worries). You don't have to start over.
I'm known for taking threads off topic and then I have to go back later and deal with what the original question was. (Sorry about that). Well, let's get back on topic.
What do you need to grow coralline? You need your tank to age, you need
consistent and balanced tank parameters, low phosphates, and you need the seeds for coralline to grow.
Let's deal with these one by one.
Tank aged? Yup.
Consistent and Balanced Ca and Alk? Unknown
Low Phosphates? Probably not as you are having cyanobacteria probs.
Seeds for coralline to grow? Unknown
Since we don't have to deal with the tank age issue, let's jump to the consistent and balanced Ca and Alkalinity issue. This is just my personal opinion-----prior to your next waterchange, I would test the replacement water for Calcium and Alkalinity and make the appropriate adjustments.
Here is a good article and
here is another.
Once you have done several waterchanges with balanced waterchange water, I would suggest Kalk to help you stay there. It has a side benefit of precipitating phosphates which also inhibit coralline. My Calcium needs exceed my ability to replenish via Kalk alone so I have been dosing with B-Ionic. However, based on Mojoreef's advice, I will be switching to the Warner Marine products shortly.
Phosphates? Are you using RO/DI water? What do you feed your fish? Beyond that, you have noticed that supplements that claim to be phosphate-free aren't always phosphate-free. To avoid going off-topic again, I'm sure there is a phosphate thread around here somewhere.
That leaves us with Seeds for Coralline to Grow. A farmer can't go plow his field and then say, "I command corn to grow". He has to go put corn seeds in. If you don't have much coralline in your tank, go buy some. Get a snail or hermit or piece of LR that has coralline on it and scrape it in front of a powerhead to spread the spores. Now your got your seeds and now you have to wait for a bit. You'll get your desired coralline algae.