I have recently started a Nano reef tank with dry rock and a live sand bed. I have started to notice some purple and pink patches on the dry rock lately. I really don’t think these were on the rock already. Unfortunately didn’t take picture of the rock when it arrived. Could this potentially be coralline algae ?
If so how has this entered the tank as I currently have no corals and only livestock is a pair of clownfish.
My guess would be maybe spores in the live sand
See pictures attached.

If so how has this entered the tank as I currently have no corals and only livestock is a pair of clownfish.
My guess would be maybe spores in the live sand
See pictures attached.

