Well, after losing about all my acros, I think the tank is stabilizing. When I tore down my 65g, I had my ato placed in one of the baffles in the sump. What I didn't know is that the magnets on the external portion of the magnet of my ATO aren't waterproof. The magnets were completely rusty and, no doubt leached back into the water and, I think may have been the cause of all my mysterious losses.
Just a reminder to check the magnets in your tank.