Update:

I went into work to check on the fish and found that another had died; the last of my original Angel Fish. The beautiful black and white, Gill.
I had a horrible feeling last night before I came home that he wasn't well, he was staying down the one side of the tank. I know they're only fish and you shouldn't get upset but I just couldn't help it. He was special; he'd come up to the top of the tank and take the food from me.

I took a water sample in and they tested it, but it was fine. I've racked my brains over just what the hell has gone wrong. We use the special drops when we have to fill the tank up with water, because tap water with all the added bits can kill fish. Maybe Craig got the amount wrong and over did it. I even upped the temperature slightly in case it was too cold during the night as winter is on the way.

I'd spent time yesterday messing with the water, cleaning the filter system out and replacing the plants so may be it had put itself right but the damage had already been done to the fish. I honestly don't know and although all the other fish seem OK, I still don't know what to expect when I go back into work on Monday. Himself said that it could just all have been a coincidence, all of the fish we've had a fair while and like any living creatures we all wear out at different rates. I honestly don’t know what else to do now.

But goes to show how special a husband I've got when he asked me if I wanted him to bury the fish instead of flushing it down the toilet like I normally do. No, I didn't, but he did take charge of the fish funeral for me as I couldn’t bring myself to do it this time.