Marian,
I'm sorry to hear about your goldfish tank. I've been jonesing lately to get a real aquarium, but this reminds me of the downside. You had such a pretty set-up too.
From everything I've read, you might want to wait a bit longer than a week before adding new fish to the tank. It seems to help a lot if the plants are starting to establish themselves and the water has stabalized, especially if there may be traces of bleach. Best of luck this time.
