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Old 10-10-2018, 09:58 AM   #2
Dave57

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i think you over-reacted on the dosing of bacteria and temperature. adding bacteria and increasing temperature at the same time is going to drive up the demand for dissolved oxygen.

You can consider reducing the water temperature to 28C (double check with another thermometer after you change the temperature on your heating rod, the thermostat in the heating rod might not be accurate) and stop dosing additional bacteria after every water change. given that ammonium and nitrite (NO2) are low, I think you have enough microorganisms within your system.

The best way to remove NO3 is water change. If you insist on the biological way, you'll need some oxygen deficient environment within your system for denitrification to take place (eg, sand bed, etc).

Salt is not required.

Anti chlorine is important during water change. The gills get injured and the fish will gasp for air when chlorine in the water is too much.
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