Good or bad?

learn2reef

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What is this and is it good or bad? The fanlike thing on the bottom left. I haven’t seen the barnacles active and they are a bit bigger than the fan thing.
Thanks!

E9DC148D-81F2-47FA-A404-091AAA39473E.jpeg
 
There are spirobid worms on base- Harmless but multiply. Can be toothbrush off and siphoned.
Often referred to a feather dusters, these are actually tube worms which use the fan to capture foof. Directing flow towards them, not at them will cause them to starve
 

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

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  • Not yet, but I have one that I want to buy in mind!

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  • No.

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  • Other (please explain).

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