Is this Coralline?

[HumuhumuFan]

I feel like a noob for having been in this hobby for a couple years now and never asked.....is this coralline? It doesn't quite like it but it is pretty rigid. It is growing in circles like this in several spots, including my heaters.

 

[ZoaAddiction81]

Definitely is that’s a good sign…….

 

[StatelineReefer]

That is absolutely coralline algae. Congrats... now invest in razors.