Need help identifying growth

[mlittle]

Can anyone help identify what all this red growth is in my aquarium? I want to make sure if it’s something harmful or not.

 

[blaxsun]

Is it hard or soft?

 

[Reeflix]

looks like it might be a sponge

 

[mlittle]

Is it hard or soft?

Soft

 

[blaxsun]

Soft

I'm also going to put my vote in the sponge column.