What ate my peppermint shrimp?

[gsar]

Salinity should be stable. It's been running with an auto top-off for quite some time but it is possible that my recent water change may have changed it slightly.

I'll check it out in the middle of the night just to make sure but they didn't seem too shy before they went missing. There's no sign of them when I feed the fish either.

I've just never heard of these fish going after them.