Thank you rboutin111. That would be very much appreciated. Would I be naive to assume that the min max water level on the side doesn't apply. If so, would I keep the third compartment filled almost to the top so the ATO can do its work? I will be running an in Tank media basket with Tunze 9001 skimmer. I decided to go with a rimless look so I used a heat gun and hacksaw and sharp razor to do the job. It turned out well for an amateur. I am in the early stages so gathering all the equipment I want will be a task. My wife, son and myself have all run into some bad luck with our health so I figured this would be a good project for us all to start together. My goal was to have fish in by Christmas but don't think it's going to happen. We'll see though. Thank you for your advice and welcome. Tim