it's real tough to maintain a constant water level using the display. Do you not have a sump? If you do put the ATO in the sump. If not then here is what I did for a while.....you can put a piece of PVC around the float switch to prevent the waves from hitting it directly. With a Vortech you are going to get varying levels as the pump runs up and down (thus the wave). This will trigger your ATO over and over again. Problem you are going to have is that the vortech not only moves water at the surface but all over the tank so you aren't going to be able to stop the ATO from cycling (at least I can't think of a way). What I have suggested should damp it out a little, but it is still going to trigger. Good luck.