How long can I keep fish in Hypo?

pitons

Member
Today, March 31, is exactly 30 days since I've had my fish at 1.009 hypo treatment. However, something happened during the process (probably salinity popped up) and only in the last couple of days have I seen no ich on the fish.
1. How much longer should I keep the tank at 1.009 to be sure ich is gone for good?
2. What is the maximum duration I can safely keep fish at 1.009?
Thanks
 
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