I guess if the definition is 50% livestock, I've had a crash then. Lost most of the fish in my 45g to ich once. Another time, Heater malfunction, wasn't a full on crash, lost a cleaner shrimp, and a Hammer coral. BUT, I didn't have much i the tank so it was like 33% of the livestock LOL

Had one major crash once - it was a direct result of a qualified fish-sitter being lazy over Christmas time not topping up water causing pump to run dry. Lost most corals.

Never happened to me. I can't imagine how horrific a sudden collapse must be.

Luckily never had to deal with it. Have 11 tanks running at the moment... really hope I never have to deal with it! Have come close latey with filters quitting cause of the crappy power service (power flickers so often shut off filters and they dont re-start every once in awhile). Keeping my fingers crossed.

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I've had some close calls that had done a real number on a couple of my tanks, but nothing that totalled the entire tank fortunately.

And now that I have voted, I am sure to go home to a completely dead tank!

Interesting results, for some reason I was expecting the number of people who have had a tank crash to be higher. Basically it looks like 2 out of three people who responded have never had one.

I had a pair of mini-crashes close together, first one due to changes in my practices and moving some sand around at the same time... DON'T MOVE ESTABLISHED SAND! And the second was due to moving the tank, again had the sandbed get stirred up. My tank doesn't seem to like having the sand disturbed.

LOL seriously I'm debating if I should pull a sicky and go home early to check everything out.

I dont want to say anything. I think i might jinx myself if I do.