One of those things i'm afraid.
I had a group of six bleheri's in a 55gal waited months for a pair to form.
once I got a pair i gave the others away, and have been waiting for the breeding to commence.
Yesterday, what I thought was the male jumped the tank (through a tiny gap near the filter inlet pipe) while I was at a funeral.
I came home, opened my front door to find a dusty, fluffy dead looking SH on my doorstep.
Put him back in the tank seems to fine, just a little shaken up. must have walked at least 10 metres to my front door from the tank!