Id plz

[Maxim.dockx]

Anybody has an idea what this is?

Tank is at his 4th week cycle. It is on real reef rock

Tank : 135 liters DT
12kilo real reef, 1 kg live rock


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[Deefish714]

Looks like sponge imo. Which would be beneficial. And a sign of quality water from what I've learned here. But Not the expert sure someone will chime in here to help

 

[Maxim.dockx]

Its about 1 cm in size


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[thegrun]

+1, sponge

 

[Bent]

Sponge