Odd bubbles

[BellaCoop]

I noticed theses little bubble looking things floating around the tank and took them out. They are hard but have a little squish when pressed on. I am pretty sure they are filled with water.... Any idea what they are?
#reefsquad

 

[Dancingmad]

Bubble Algae - appropriately named, huh?

 

[saltyfilmfolks]

Bubble algae.

 

[Leslie Tabor]

Oh no, that is bubble algae. Try not to break them in your tank - regardless of what some ppl say - that helps it spread. I have found using a section of plastic tubing and with all my pumps and returns OFF, suctioning it out works quite well, along with good water quality.