Could age have been a factor in their deaths?
Maybe as the neons became smaller the last remaining ones began to feel lonely and like their was no reason for living. I think this happened to a killiefish pair that I had. The male jumped out of the tank and the female died shortly after. She was a young fish I think she gave up and felt her life was pointless.
It's a tough call with the bosemani but hopefully you figure it out. You could try putting him back in but keep a close eye on him and the tank maybe?
Maybe as the neons became smaller the last remaining ones began to feel lonely and like their was no reason for living. I think this happened to a killiefish pair that I had. The male jumped out of the tank and the female died shortly after. She was a young fish I think she gave up and felt her life was pointless.
It's a tough call with the bosemani but hopefully you figure it out. You could try putting him back in but keep a close eye on him and the tank maybe?