Wtf is this ?????

Hi. Hoping for some ideas again. After posting the photo of what was identified as bubble algea I noticed 2 more at different locations on the rocks. Well all 3 have suddenly disappeared ??? Do tangs eat this stuff ?? Which one would be more likely too do that ??? Is there any other explanation as to why all 3 have just vanished within. 3 days of each other ? Thanks
They break free and get sucked up in the filtre Lesely. One of my Powder Blues eats the stuff on occasion so he could have taken care of it for you.
Well i had three of the little buggers and know they are all gone. I have no crab that I know of so it must have been a fish. As long as I dont get any more i am happy. lol