[Zbrafish] pH problem

[raj abi]

Hi,
   
  I'm experiencing a reduction in water pH in some of my zebra fish RAS racks and animals started showing the symptoms.In some of them it went below 4.5.
  What is to be done to correct it?Pls let me know from your experiences of similar situations.
   
  thanks&best regards
  Rajesh
  University of Toronto

       
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