So my tank has been set up since last spring and I have had good success with my livestock, but recently I have begun to get curious about the deep reddish-brown colored growths on my live rock. A friend told me it is likely sponge growth, but I guess I would like a second opinion.
In this first picture you can see the coloration of this growth as compared with some coraline algae (blurry purple splotches) towards the bottom of the rock.
In this image you can see one of my rocks almost completely covered in the purple growth:
And in this image there are some other tiny pinkish growths that look like little baobab trees, they are all over most my live rock, and I don't know what they are either:
thanks in advance for the help.
In this first picture you can see the coloration of this growth as compared with some coraline algae (blurry purple splotches) towards the bottom of the rock.

In this image you can see one of my rocks almost completely covered in the purple growth:

And in this image there are some other tiny pinkish growths that look like little baobab trees, they are all over most my live rock, and I don't know what they are either:

thanks in advance for the help.