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Alright TPT I am very confused, over the last week I have been having a few deaths in my 55 planted display tank. Started with a very old rainbow shark, I checked my water parameters and was at 0 NH4, 0 NO2, and 30 NO3 so I did a water change but figured it was due to old age. A couple days later I lost an angel rechecked water and was at 0 NH4, 0 NO2, and 20 NO3. 3 days later I have 2 dead rams water reads 0 NH4, 0 NO2, and 20 NO3.

No chemicals have been used near the tank.
No new additions for the last couple of months.
Fish look nice and healthy with no outward signs off illness, no odd behavior, clamped fins, blotches, spots, etc., with the exception of the angel not eating well the evening before it died.
The other 7 tanks in the house have had no losses.

I am at a loss as to what to do here and hoping someone has an idea what is going on.
 

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Might wonder if water treatment plant has increased chlorine or chloramines which might mean more dechlorinator is needed than usual.
Might check to see that fish food has not expired or been tampered with.
Might check thermometer to see that temp is within normal range.
Is all I got.
 

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So even the angel was a relatively "swift death". If it were me, I'd be thinking along the lines of a contamination / poisoning of some sort in your water change. Bacteria and fungus of the ilk we usually deal with don't work that fast.
 
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