Id please

Emarley

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Hello fellow reefers,

Got a few of these white things on the back wall of my tank. Can someone id please and are they good or bad?

Thanks in advance

Dom

FFBED81F-F3AD-453B-923C-DCCC97DD411A.jpeg
 

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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