Purple Up is just a calcium additive. They use argonite apparantly so that the calcium stays on the rock... As long as your levels are good, then I wouldn't worry about adding anything.
If you want to spread the coraline out in your tank all you have to do is take a small rock and scrape the coraline off right into the path of a powerhead. This will disperse the coraline all over your tank and help speed up the process a little. Really, it is just a matter of time. I find it takes about 3 + months in a new setup before it starts spreading like crazy.
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