Well, since the end of the world did not happen yesterday, I thought I would post pics on the Tunze ATO for anyone interested in it.
Here is my one-of-a-kind, unique and amazing, custom built emerald green reservoir! (It's just a 22 gal bin I picked up from WalMart to use temporarily until I get a better suited one, heh-heh

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The sticky back of the velcro for tht controller sticks well to plastic and glass, but not to wood. So, I screwed one part of the velcro to the wood.
Here's a wide shot of the sump, with the sensors:
An overhead shot of the return section, and a close up of the sensors from the front:
The bottom of that masking tape marks where I want the water level to be, and the magic eye sensor keeps it right at that level with very minimal deviation. The white emergency mechanical float switch is set up much higher. This allows water changes without shutting the ATO system off. It is also still low enough so that should the magic eye sensor fail and the water reach that float sensor, the power to the pump will shut off and the alarm will sound. Should a second catastrophe immediately follow, such as a power outage and the DT and refugium drain into the sump, the sump water will rise only to within 1 inch of the top and no more.
The ATO ouput tube has to be higher than the water level in the reservoir so that it won't siphon the water out. Since the water level in my reservoir is higher than the sump water level, the output tube sit high above the water in the sump and makes a "tinkling" noise. So, I tucked the black output tube under some blue reactor tubes, and voila! No more tinkling noiise.