No good, if you can seed it from another coraline soaked rock that would work much better than purple up.
I got that stuff growing everywhere, I can't even get it to stop.
It grows much better with Actinics as it doesn't have to compete against other strains of algae when white light is exposed.
My T5 tank is completely purple... I recently had to reseed new liverock there was no traces of coraline on them. Now it's infested.