What am I please

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My cats in the tank cannot leave me alone...
 
hate to butt in but not to create another thread about ID’s. Can anyone guess what this is and if it’s beneficial to a reef tank or not? My guess would be something near an emerald crab cause of the hair legs.
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I knew it was an algae! ;)


Can anyone guess what this is and if it’s beneficial to a reef tank or not?

I have no idea what that species is but hairy-legged crabs are generally evil!
 
Reminds me of coralline algae (the kind that plates)...when exposed to air, it will glow bright under the leds like in your picture.
 

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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