blue coraline

[StixS]

i was jus wondering if there was such a thing as blue coraline algae since there are pink purple orange and red kinds. because i have somthing that looks like blue coraline but im not so sure as to wat it is or if there really is such a thing, does anyone have any idea or any pictures ?

 

[malkore]

I've not see blue coralline, but i'm no expert. could be a sponge or some coral growth.