Coraline algae ?
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A photo under white light would help. Considering the tank age it's very well possible. You can scrape some of it off and put it in some vinegar. It should dissolve and fizz a bit as coralline algae is calcium carbonate to a large extent.
It's also possible you have some other encrusting algae that (strictly speaking) isn't coralline algae (taxinomic order: Corallinales), but something else. The community would still refer to it as coralline as long as it's encrusting
It's also possible you have some other encrusting algae that (strictly speaking) isn't coralline algae (taxinomic order: Corallinales), but something else. The community would still refer to it as coralline as long as it's encrusting
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