Coralline growth question

Int his photo you see a power-head with old coralline splotches (from my previous set up which had a lot). I don't have any coralline in my tank (that I see) other than what is on the back of a snail that I purches a few weeks ago. I recently scraped some off of his back into the water in an effort to "seed" the tank. They are starting to get a purple tint to them (unless I'm seeing things. Is coralline known to target old calcified regions first?

Thanks.

 

answer yes it will grow back over old dead stuff.....not sure if it does any faster than a bare spot

 

It's (old calcified growth) the only place I see a purple tint. I see it on the old calcified spots on my rock too. Maybe I'm just seeing it because I want to see it.

 

i too have noticed when my coralline came back, it grew over the old white calcified remains pretty quickly, well it seemed at least faster then other spots.