11-18-2013, 08:00 PM
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The whole "No water changes, just adding a gallon of water a week" is a huge red flag. Iv explained this to a friend that did the same. Water evaporates, Toxins DO NOT. In fact the toxins (ammonia, nitrites, phosphates etc.) become more concentrated the less water there is which may have been the cause. Adding a large # of fish into an aquarium thats already high in toxins most def didnt help. Once you get your tank all better, stick with frequent water changes, vacuuming. Good luck!