On my JBJ12 microbubbles was either low water level, or one time the hose from the pump up to the outlet had a small crack in it where air was sucked in by the passing water.
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Single System Setup: 210G SPS reef, 225G FOWLR, 72G water change, 50G frag, 120G sump. I promise a journal at some point! (anyone need some coral frags? I likely always have stuff that is frag-ready)
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