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Matured DSB question


RAV-65
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Hi all,

saw a reef tank today with a DSB, there were little gas bubbles raising from the sandbed every now and den... Is that a sign of a matured DSB??

i think,the trapped bubble within the sandbed is the nitrogen gas..if it is just on the surface then it is the algae...

mine has alot... :D on the surface :( ...

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