I wouldnt be in a rush to start adding stuff to your tank so early on. The coralline will spread naturally, it will take a few months maybe, but as long as you have some in the tank already it will go to other rocks, promsie. lol'
Running your lights during a cycle will most likely get you nuisance algae more than anything else, purple up or no purple up.
180g Reef - 60g Rimless Reef -90G FOWLR- 125g Malawi Cichlids- 40b REEF- 34g Fresh Planted-working on- 20L FOWLR- working on
I have a mix of many different saltwater fish amongst my tanks, but I love my Tangs most of all.