Random facts in water parameters (updated 2012/04/17)

General:
- 0.1ppm of NO2 is considered the limit for aquatic animal safety.
- 0.2ppm of NH3 is considered the limit for aquatic animal safety.

Shrimping Conclusion : 

- NO2 and NH3 should always be 0.


NO2-
- NO2 toxin isn't affected by temperature, and isn't affected much by PH. (4)
- But some says the the toxin of NO2 isn't affected much by temperature in basic water only. (3)
- NO2 toxin reduces as GH increases. (4)
- NO2 is more toxic when dissolved oxygen is lower (NO2 affects oxygen carrying, lower DO in higher temperature)
- NO2 is slightly acidic, in low PH it more easily formed.
Shrimping Conclusion : not much we can do other than make sure bacteria is establish to convert NO2- to NO3-.


 NH3:
- NH3 is more toxic when temperature or PH is higher

Shrimping Conclusion: 

- Be alerted when it gets too warm, NH3 can be a bigger issue.

- Lower PH to minimize NH3 toxin (NH3 -> NH4)


PH:
- Low PH affects oxygen carrying ability. (Shrimps need more DO to compensate low PH).
- High PH affects gill ability and can cause problem.

Shrimpping Conclusion:

- Make sure water is well aerated  in low PH tank.



Reference: (some in Chinese)
1. http://www.chinaas.cn/technic/Detail.action?id=ff808081365ef9720136813d81af044d
2. http://www.njrsc.net/yztx/html/?99.html
3. http://www.yjhtyz.com/s04/yjhtyz/jswz/20111217/545797.html
4. http://www.laoshan.gov.cn/n206250/n194245/n1580597/n12024377/n12024378/12025572.html