I can start with "how to break a tank".
A year ago I bought a second hand tank on an auction. I did a great buy, and was very satisfied. It was a 125-liter tank, and I knew exactly what I would use it for. So after a few days, I wanted to start preparing it for the new inhabitant. First: sand. I had a bucket of used sand in my car, and as I had planned to let this tank be running without fish for a while, I didn't care for washing it first. So I fetched the bucket, and brought it back in. This was in February, and it was cold outside. So cold that the sand was totally frozen. But instead of doing the senisble, putting the bucket aside, waiting for it to melt, I thought why not just put the bucket upside down into the tank, and when the sand melts, it will fall into the tank. Yes, sometimes my brain just doesn't work! I have no idea what I was thinking of, or rather, i wasn't thinking anything sensible at all. I turned the bucket upside down, and heard a bang and a crash. Yes, the whole block of sand-ice came straigt out of the bucked and broke the bottom of the tank. And I was a bit agry with myself...

