Don't you just love that when you are fixing one thing on you tank and that leads you to find something much worse? Some ants decided that they too enjoyed the reef and took up residence in the back of the tank. So this morning I am relocating the ants to the vacuum and notice that the Tunze ATO is not flush against the tank wall. After unsuccessfully trying to reattach it I notice the reason it will no longer stick. The tank inhabitants seem okay but I am concerned about what this has leached into the tank. Water change in progress.