Where do missing fish go?

[PFisher]

I was just wondering if this is a common problem or if anyone has an explanation. I had a six-line wrasse named Painin for just over two years and last week he just dissapeared. No ammonia spikes, no dried fish on the floor, no cats or dogs. He just dissapeared.

He will be missed. He was a good fish, he lived up to his name at times, but he was a good fish.