"Gill Passman" gillspamattaylorpassmanspam.co.uk wrote in message
.. .

They are absolutely fine until it happens. Swimming around happily
and
feeding well - last night everyone was absolutely normal. No sign
of any
bloating or distress or any marks on them at all. Then I just find
them at
the bottom of the tank hardly moving and then they die. Gill
movement is
normal and as I said there is no sign of any fungal infection or
injury....



Any foreign materials in tank? Recent addition of decorations?