3 Green Bubbles on LR

[scarr105]

I've notice 3 green bubbles on my LR, that was not there a few days ago. I went on Vacation for 4 days and when I came back I noticed the 3 green bubbles on my LR. They look like you could just pop them with a pin but I've watched my blue legged crabs walk over them and not brake them. I'm trying to get a good picture of them but the camera doensn't seem to take very good pictures. I have no fish and only 10 pounds of LR in my 55g tank right now. I have a big cleaning crew 40 snails(mix), 40 (blue legged crabs), brittle star, cucumber.

 

[greatfullreefer]

Bubble algae, try to remove without breaking them. If they break they will release spores and will become a severe nusience.

 

[binhzino]

emerald crabs if you happen to have a lot more, if not just put your hand in there and take em out...