I have had 2 fish do a disappearing act. I had a full grown Cherry Barb and a full grown Mollie vanish. I haven't seen them in a few days and have been thinking they are under some decor or something. During my tank cleaning tonight, I removed everything and no sign of them. I have nothing in that tank big enough to eat them. The biggest fish in there is a 3" rosy Barb.
That's too funny!