10-25-2011, 07:37 PM
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For number 1, I meant recently as in today, yesterday, a week ago, etc.
For number 2, I'm talking your temperature, ammonia, nitrite, and nitrate.
For number 3, your tank only comes out to about 25 gallons, which leads to a potential problem with
Number 4, your tank sounds overstocked.
My guess is that your ammonia/nitrite/nitrate are probably off the charts, and causing bad water conditions that are toxic to the fish. I'd suggest getting yourself a kit to test for these, and if you have ANY ammonia/nitrite, you need to do an immediate water change. Don't purchase anymore fish for the time being, and realize that it's very possible you may have more casualties because of these conditions.