In all of this I see two flaws...
1) Tank was left unattended for too long (if you value your tank someone should check it
daily).
2) Alarms should have to be manually reset (that's
really basic engineering).
In the end though, it's all about redundancy. Redundancy is the only insurance we have. No way on Earth would I have my system set up in a way that would allow that much freshwater (or dosing fluids) to be pumped into the display. I think sometimes we rely on computers and gadgets too much, and put too much faith in them.
My system is designed so that if my freshwater bin gets pumped dry for some reason the sump can even hold all the volume so I wouldn't even have a wet floor. The top off bin needs to be refilled every second or third day, and that's fine by me because it's a safe way to do it. I cringe when people have their top off system hooked up to unlimited supplies of water. It's an accident waiting to happen. My dosing canisters are small; I have large premixed containers that I use to refill the dosing canisters once a week. My dosing pumps
have dosed a whole weeks' worth of fluid in about 8 hours which ran the dosing canister dry. This was not enough to cause significant reactions. The redundancy I have implemented means I have to "do stuff" with the tank more often, but I have a lot of time, money, and energy in that glass box so it is worth it to me. When I go on holidays an aquarium maintenance company checks my tanks 1-2 times per day. It's not cheap, but neither are the corals in the tank!
