sponge? feather duster?

KnightlyBuzz

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I’m a reef tank rookie (40 gallon breeder w/ 15 gallon sump since Dec 2019). This is growing on sea lettuce in sump. Is it a sponge or perhaps a feather duster? It contracts aperiodically (see pics).

D6B4C6AC-3ED0-496A-8F15-ABD9786C9F7F.jpeg D9080E13-A0C6-45CA-9BC0-98670126C1C5.jpeg 86DD8CFC-76E0-49E1-AADC-F1040F69D592.jpeg
 
Nice, thanks! (I had to look ‘em up to make sure it wasn’t something bad. Ha!)
 

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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