Bubble algae, I assume?

[Rivus]

Just noticed this, it is magnified as the mushroom on the right is <1". To my naked eye it looks sparkly but zoomed in the photo, it's bubbly. The start of something bad? I do have a couple of emerald crabs. They have been in there since before I noticed this growth, so not likely they're going to be of any help.

 

[SteveEreef]

Yes looks like bubble algae. I had a little bit in my tank so I took it out by hand as my CUC didn’t touch it

 

[Oshengems]

Yup 100% bubble algae, get a male emeral crab the females don’t eat it and most algaeas in my experience, if you can’t get that piece out of the tank, remember that if you pop any of those bubbles it will most likely spread. If you are able to take it out try not to pop and rinse the coral on water before you added back again but I’ve had this in my tank for almost a year after the emerald I learned to live with it since he eats most of it so a patch will pop up a few weeks later he’s eating it

 

[davilahope]

Yup 100% bubble algae, get a male emeral crab the females don’t eat it and most algaeas in my experience, if you can’t get that piece out of the tank, remember that if you pop any of those bubbles it will most likely spread. If you are able to take it out try not to pop and rinse the coral on water before you added back again but I’ve had this in my tank for almost a year after the emerald I learned to live with it since he eats most of it so a patch will pop up a few weeks later he’s eating it

How do you distinguish a Male from a female emerald crab