I have a small reef tank (Red Sea Reefer 170) and the ATO that comes with it is mechanical float-based... its junk so I replaced with a optical-sensor based ATO that works real well - but the fresh water reserve only holds about a gallon... when it runs out the ATO will shut off so the pump doesn't burn out and start beeping to let you know it's run dry.
Once the fresh water is replenished the ATO needs to be reset by power cycling it - so I've found the most convenient way to do this is to use a z-wave on/off plug. I called it "fish tank" and I just say Alexa turn off fish tank... refill the reservoir when I get a chance and then say Alexa turn on fish tank to reset.
It works pretty good, but here's the thing... if I am not home the thing just beeps forever and I would prefer not to torture the other pets in the house. So - I am looking for some suggestions as to how I might automate turning it off? I would then just use notifications to alert me.
I've seen there are some sound sensors but they appear to be geared toward fire-alarms (this isn't loud enough) so I am thinking I might need to get a relay and "something?" else