This dark stuff appears to be irritating some zoas or even attacking them. It has some air bubbles on it. This is the only place in the tank that I see this.
This is behind the right mushroom and appears to be branched. I don't see it moving in the current.
This is behind the baby mushroom.
This is behind the right mushroom and appears to be branched. I don't see it moving in the current.
This is behind the baby mushroom.