10-11-2013, 01:14 PM
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I had the same thing happen with only a 3 gallon water change in my 30 gallon tank.
The municipal water supplies are recently switching over to Chloramine, (Chlorine and Ammonia). Kills fish and probably will reduce the surplus population of humans also.
Sometimes, these guys are really adding a strong amount to the water! Where I live you can smell the stuff when they add a bunch to the water.
Age your water before adding it to the tank.
I know this sounds crazy, but back when I was young they never did water changes. We had 6 tanks, doing super, (the black skirt tetras lived for 8 years), with just adding water due to evaporation. Sure we would clean the gravel, but we never did a water change in 8 years. It was the old-fashioned side filters carbon and floss with a "silent giant" pump. Not only that, but the "Innes" idea back then we kept a whole bunch of fish in the tanks without any trouble.