AWOL Danio

The female Panda Cory that I noticed wasn't well a week ago might actually be making a recovery. She's been out a little more this afternoon and the marks on her side seem to have subsided. Likewise, the male Guppy is a little more active.

But what is strange is that the Danio who has been misbehaving - swimming vertically at one point - is missing. He's nowhere to be found there's not even a dead body. I've ripped out most of the plants and ornaments in turn to see if he is about, but I just cannot find him. I wouldn't have thought that the snails would have eaten the entire fish - bones included! In the past the most I've witnessed is the fish stripped to a skeleton, and that was a small Neon.

Maintenance - 20% water change; old filter running in tandom with new filter.