Very sorry to hear about your fish How terrible! Good luck working things out with the water company (if you have anything to work out with them or are going to try and get compensation from them). I hope all the rest of your fishies do okay. This is probably obvious, but sometimes we tend to overlook the obvious - I'd recommend not doing any more water changes with the tap water until you know the water's okay again. Again, good luck. Keep us updated, 'kay?