I've been taking this for granted for years, and now it's occurred to me that it might be fixable. I've had air bubbles coming out of the inputs to my tank for over a year now. Before I tore it down, it happened with both of the inputs, and now that I've resurrected it, it's only happening on one side.
Is there anything I can do to stop air from getting into the plumbing somehow? It's driving me nuts! Both of the returns are hooked up to their own Mag 3 pump (2 pumps total), and have flexible tubing leading up to the standard overflow kits that came with the Oceanic tank (I think they might be All-Glass Megaflows). Up in the display tank I have angled both outputs so that they're submerged, so I know it's not air being mixed in by bubbles from the return flow hitting the surface.
Is there anything that can be done to fix this? Has anyone ever had this issue before?