What is this?!? Weird blue algae.

[chicklets]

Hi guys! I went out of town for 2 days and came back to this in my tank. It's in the back by my carpet anemone. I have never seen anything like this! Anyone know what this is? No new additions except a wrasse a few weeks ago.

 

[Foxy-88]

I have something similar also. I'm going to hope on board with this post because I have no clue also haha hard to see in this picture but it's definitely there. Sorry I can't be of help

 

[sc50964]

Cyno bacterial. Increase flow and clean your tank, especially in the dead spot. Check phosphate level.

 

[chicklets]

Thank you so much! I've never seen it be blue like that!

 

[sc50964]

Just google cyanobacteria and you will see Wikipedia also calls it blue-green bacteria.