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Water level is fine. I'm now thinking the problem is that I have removed the bio balls and the water dropping in that chamber is causing the bubbles. I don't really want to put back in the bio balls. What are folks putting in this chamber other than bio balls. I was planning on putting in...

Just bought a 14g. Oceanic Bio Cube. Have had it up and running about 2 weeks. I continually get micro bubbles coming out of the return. I've checked all the connections to make sure they are tight, the sponge is in the right place to prevent bubbles from entering the pump. I even had...