VF> Was it a brand new tank? If so, did you treat the water?
 VF> Did the heater suddenly break in the "on" position?
 VF> Did you do a water change lately? Did you treat the water?
 VF> Did you add a lot of new fish to a tank that hadn't had many? What 
umber
 VF> of fish? What size of tank? 
 VF> 
 VF> Your problem was probably one of the following:
 VF> 
 VF> a)      Chlorine or Chloramine in the water.
 VF> b)      Massive ammonia or nitrate spike due to increased bioload
 VF> c)      Massive Ph shift due to water change or increased bioload
  
I did change the water the day before...
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