What can cause all fish to mysteriously die quickly?
5/4/06 I am looking for suggestions and ideas on what might have wiped out all of the fish in my wife’s 65 gal tank within about 36 hours. <... likely environmental, though there are some fast-acting pathogens...> A few days ago my wife’s largest Percula Clown started acting funny, hanging around the bottom of the tank and appearing to gasp slowly and fighting to get back to the top of the water column. But he was still eating. The next day I felt he was acting more lethargic. The next morning he was dead. So was her six line wrasse. Another chemical check showed PH had dropped to 7.8 overnight
