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Cultivated Reef

Microbubbles everywhere in jbj nano cube 20g


Atxgal

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I just got a Jbj nano cube 20g aio. I did not make any modifications so all items are stock products. This morning there was a big gapping hole in the fine sand substrate so im not sure if the fine sand got into the chambers and had some adverse affects which has caused the bubbles but it wasn't there before.. I put a valve on the return pump and turned the flow down but I can see by the way my fish are hovering that the flow isn't enough. So if I turn the pressure on again the bubbles return. I checked the hoses to make sure there are no holes. I have carbon and a sponge in the first chamber, carbon, purigen, and ceramic rings in the middle chamber and only the return pump in the last chamber. Any advice I dont want to see my two fish swimming upside down because of these bubbles. Also when I took the return pump out there was fine sand on the top of the pump. 

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