Why No Purple Algae?

[reeftankdude]

My tank is a 20 gallon high three months old. My lighting is two Coralife Marine Clip-On LED lights. I am dosing three times a week Kent's Nano Reef Part A and B. My parameters are good with 20 snails, a few scarlet hermits and fish. I have no corals in the tank at this time. I have green coralline algae spreeding, but no purple coralline algae. What do I need to do to get the purple going? Thanks all

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[Zach B]

Not positive that you have green coralline but if it is, often coralline will start green and change to pink/purple. This takes time and stability. Best of luck

 

[SaltySam09]

It comes in on its own naturally, some people will add bottled coralline spores, but I found this to be unnecessary.

 

[ying yang]

You 100% sure that's green coraline algae and not just normal green algae ?
And by looks of your white rocks ( apart from green on top) it looks like super new tank.
If so then just time will make it happen,ovbiously need some way if getting purple coraline algae into your tank like scrapings from someone else's tank or a snail,hermit or some on a coral frag plug then your tank will get little splodges here and there then will gradually get more aslong as nothing eating it like a urchin for example.
Usually corealine algae grows on plastic parts like wave makers,overflows,return nozzles then spreads to the rocks / glass later.
If search on r2r on other threads,some say mag at certain level helps .

 

[Mr. Mojo Rising]

I think its wishful thinking to have coraline in 3 months if you start with dry white rocks. Mine is a year and half old, still no coraline on rocks, only on the glass and machines.

IMO your rocks are just growing what will be normal green algae. But you will know soon enough

 

[reeftankdude]

Not positive that you have green coralline but if it is, often coralline will start green and change to pink/purple. This takes time and stability. Best of luck

I just looked at the rock with a magnifying glass. I saw brownish purple spots.