Thanks for the kind words. As for the ATO my sensor is in the middle chamber with the top off hose in the left chamber between the overflow and return chamber. I've got it dialed in so the slightest amount of water or coral removed from the tank and the top off kicks in. I test by removing a cup of water and let the top off flow back into the Top off container. As soon as I add the SW cup back to the tank the ATO shuts off and stops. Let me know if you have any questions. I have several sets of both types of the AutoAqua ATO systems and I've figured out most of the little issues. On the micro I don't run the air gap adapter. Just be sure the ATO container is lower than the tank and make sure the ATO hose is not sumbmerged in the rear sump of the tank. Otherwise you'll create a siphon. Best of luck.