Have all died! We are presently on holiday, we have almost a week left from our 2 weeks and my mother in law sent me a text. All our fish are dead! We have had them for over 5 years, I left her instructions, so I don't know what she has done wrong. I told the children, they want more, but I have said no as it's me that has to look after them.
My mother in law has sent me another text to say that one of the fish she thought was dead, seems to be alright now. I assume she didn't rinse the tank clean after she washed it (i always use Cif) so we may still have one.