What is this white stuff all over my rock.

Tank is almost 2 years old I added new rock but this stuff was there about a month before I added the new rock.

20191101_230806.jpg 20191101_230802.jpg
Bryozoan filter feeder.
 

IF YOU HAD TO TAKE A REEFING EXAM, WOULD YOU PASS?

  • Yes!

    Votes: 32 45.7%
  • Not yet, but I have one that I want to buy in mind!

    Votes: 9 12.9%
  • No.

    Votes: 26 37.1%
  • Other (please explain).

    Votes: 3 4.3%
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