Thanks for the replies.
I did think it may have been too much to hope for, for the original pandas to survive, but I would still like to think the is hope for the other 2, I guess only time will tell.
As for Spot's fin, there is no colouration around the missing bit of fin, it is just missing. Barbels are all ok on both of them too, wheras plop's had shortened, and as such I was even more concerned, but I now think that both original pandas main problems probably stemmed from the chlorine.
It is just such a shame that its not until you've seached these forums that you realise they are so sensitive, as books, lfs and the sort of stats pages related to them all point to them being easy to look after. I'm hoping we can get it all sorted enough to be able to keep pandas on the long term as they really are super.
This leads to a general question though as to introducing fish in the first place if you want showling fish.... you can't get many at a time, but they are not happy until they are in some sort of number. Now originally, going back to when I first got the fish the lfs said leave it a week and come back to get more, now, I obviously haven't done that and won't be for a while, until I am sure the current occupants are all ok, but when I do go back, I'll probably be getting a couple more guppies, as they are less sensitive, but that leaves the pour pandas without their mates for even longer, putting more strain on them! We probably only want the two breeds in there, unless there is a really good tank mate for them as a kind of specimin fish, but although it is a 60l tank with substrate and decor there is only 50l of water, so I'm not sure if we could have anything else if we have 6/7 guppies and 6/7 pandas.
Lisa.