Help ID fast growing red thing(sponge)?

[Afkomjorgen]

Anybody able to help me ID this or decide if it’s an issue?
showed up about 3 weeks ago and has been growing rapidly over any surface ( rocks, macro algae, upwards)
I haven’t touched it yet

thank you

 

[Spare time]

Looks like cyano or spirulina with air bubbles from the pic. have you tried brushing it away?

 

[Afkomjorgen]

Looks like cyano or spirulina with air bubbles from the pic. have you tried brushing it away?

I haven’t. But I will try today!