What is this on my rock??

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Saltwater_hobbiest

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This thing on my rock keeps moving around but I have no idea what it is, is it bad or good for my reef tank?

IMG_7373.jpeg
 
Printed Reef CaddyStack filter tower, Neptune Syst

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BRS

WHAT CHANGED THE MOST IN A FISH AS IT MATURED IN YOUR REEF?

  • Size or body shape

    Votes: 3 25.0%

  • Color or pattern

    Votes: 3 25.0%

  • Personality or confidence

    Votes: 0 0.0%

  • Aggression or territorial behavior

    Votes: 2 16.7%

  • Feeding habits

    Votes: 0 0.0%

  • Social behavior or bonding

    Votes: 4 33.3%

  • It really hasn’t changed much

    Votes: 0 0.0%

  • Something else (Tell us what I didn't think of)

    Votes: 0 0.0%
See comments…

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