What’s on my rock?

kinder23

Non-member
Can anyone identify these spots. Doesn’t looks like pictures from any nuisance algae guide I’ve seen. Had some Cyanobacteria in my fuge and some of these spots in my DT. I killed the light in my fuge for a few days to kill it and now these spots have increased in my DT. Seems different from cyano as it can’t be blown or scraped off rock easily.
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Could it be a dark red coraline? I have that it doesn’t blow off but is softer feeling. Almost slim like.
 
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