SOMETHING ON MY LIVE ROCK

There's something growing on my live rocks. I started to get purple coralline here and there along with greenish/brown spots on my live rock. The spots are of all sizes around my rock work. Please see below and let me know if I should be concerned and what it is. Thanks.

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cannot really tell but there is a green coralline. How long have you had the rock and how long was it out of water?
 
I've had my rocks since April and I bought it from a LFS, so I'm not sure how long it has been out of the water or if it ever was for a long period of time.
 
It's soft. It's not like scraping coralline. When I scraped at my coralline it turns into flakes and spreads around. When I scraped at this particular thing, it's mushy vice flaky. Kind of like scraping brown algae.
 
It's soft. It's not like scraping coralline. When I scraped at my coralline it turns into flakes and spreads around. When I scraped at this particular thing, it's mushy vice flaky. Kind of like scraping brown algae.
 
I'm seeing new growth of purple coralline in different areas of my tank, but this thing seems to be more prevalent in my tank. Please help! I even changed every single bulb in my light fixture and it doesn't seem to be slowing down!
 
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