What is this rash looking algae growth?

jackiefriday

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20260721_221014_EF3FC3CE-3FC0-4857-99ED-F5467BC1DB28.png
 
You mean those tiny dots?
Coralline algae can start to grow this way, but without microscope I won't be able to tell for sure. It can come in different colors: green, brown, red, pink, etc. Unfortunately the ugly green and brown types seem to grow first 😅 but the nice red and pink ones will follow to cover the rocks and if you want also the back wall.

Is it "difficult" to scrape off? If yes it's very likely coralline algae which would fit your tank's age of 8-9 months or so according to your last posts.
 
What do you want us to see in this picture?
 

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