I used to have this problem as well. I have a korallia nano in my ATO tank to stir up the water whenever my ATO pump turns on. I use a Tom's aqualifter so I don't have to worry too much about running dry. I have the intake of the pump higher than the power head so it won't run dry.
I ran into the same problem with forgetting to fill the ATO tank. So I just used a float valve and wired it to my controller to email me when it gets to a certain level.
I like the flashing light idea though. I can see when that is useful because I walk past the sump room and it would be a great visual reminder!
Thanks for the idea. Great share!
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