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Where will the discharge from the ATO be going?
Into the sump? If, yes, how tall is your sump?
The discharge opening will be the height limit of your ATO container's water level. If the water level is any higher it will siphon out. I had that issue when looking for a tall and narrow container. Ended up with an AA one, but can't fill it up all the way --- I have to leave a couple of inches.
I'm not entirely sure I understand what you are asking. I have a 50g sump that is 15" tall filled with 8" of water. The ATO Box will be set between the end of the sump and the stand wall. I have a Tunze ATO with a pump that will pump the water out of the container and into my sump. For the AA box the output is on the top lid so it would go out the top and down into my sump.
Hopefully that makes sense




