Why do tanks crash?

[viperfish]

Mine started when I purchased my Apex Controller. There was a problem with the sensitivity and it would constantly reset the EB8 so a heater became a chiller dosing pumps would run contsantly etc. etc. it would reset on randon days but always at midnight. so a lot of damage was done while I was sleeping. I finally went online with it and the rep from Neptune logged into my controller and fixed it up. It is a great controller and I've sworn by it ever since. I did lose almost all my SPS in the process, a bunch of inverts died, cyano outbreak to the point where I had to bake my rock to cure it. To make matters worst I transferred my fish to a tank without a controller, I had the temp set correctly in the holding tank with my Rena heater. That night the heater stuck on an I woke up with all my fish dead! Some of these I had for years, my large yellow Tang and Hippo Tang were the biggest dissappointment. The silver lining was my Maxima and Squamosa clams lived! Go figure. I'm a big fan of redundancy but I learned the hard way that it just takes a moment and it can happen to anyone.