Somehow I have been cursed with bad fishtank luck.

First there were the many unexplained fish deaths.

This morning my filter spontaneously ran dry. The tank was full, the filter was cleaned two days ago and has been running smoothly since then, there were no leaks in the casing or the intake tube, there was just nothing that I can find that would make the filter run dry.

And yet it did. Dry as a bone.