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[APD] Sudden death of all the healthy yamato shrimp
I have a 2ft (80Litres) planted tank that is 6 month old. An external Eheim 2213 was used for filtration.
The lighting is 2 x 36W PL tube, 6 hr of illumination each day.
My stocking density was:
- 80 Glowlight Tetra
- 30 Yamato shrimps
A few day ago I decided to redo the layout. No water change was done.
I used back the existing plant and some from another tank.
My new stocking density is:
- 50 Yamato shrimps
- 10 Malayan shrimps
- 15 Cardinal tetra
- 10 Harlequin tetra
- 5 Rummy nose tetra
After some feeding, I switched off the light at around midnight. Both shrimps and fishes look fine and active.
No distress was observed.
But the next morning at 7am, I found some fishes and all the Yamato dead.
The fish are breathing frantically at the waterline.
The water test shows:
kH: Not tested (there are 2 handful of coral chip in the filter)
GH: Not tested
NO2: 0.3 ppm (due to the decay of the shrimp)
NH3/NH4: 0 ppm
Cu: 0 ppm
Cl: 0 ppm
After that I did a 50% water change and added AMMO-LOCK for water treatment.
I left the light on for 8 hr before going to work. When I reached home, the fishes were still showing sign of distress.
They were breathing at the waterline.
So I connect an airline with an airstone to provide more oxygen to the fish.
Could it be an Ammonia or Nitrate spike ? I used fertilizer like KH2PO4, K2SO4 and KNO3 without ill-effect.
Could I have caused a re-cycling of the beneficial bacterial ?
Why is the fish breathing so frantically ? What cause the suddenly depletion of oxygen in the water ?
What killed the shrimps ?
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