I am still experiencing unresolved problems.
Shortly after 5/1/2018, I lost all of my koi due to a huge ammonia spike above 8.0ppm. I did multiple water changes to no avail, including a 100% water change. For the past 3 weeks, my filter has been up and running with no fish.
I discovered that my municipality went from chlorine to chloramine as a disinfectant for the water. The problem became worse because I used a dechlorinating product, which in actuallity stripped the chlorine and left free unbound ammonia in the water, hence the cause of the huge spike.
Since my fish died, I have scrubbed and cleaned my pond, started with one week of running the filter, loading the filter with microbes (Microlift) the next week adding the UV light and the following week adding additional water. This past week I inserted two 3 year old koi into the pond and all went well until today. Mind you I tested the water two times a day and all was good.
I returned home this eveing from work and discovered my new fish dead in the bottom of my pond. The water again tested well within the limits:
- low pH 7.0, high pH 7.2
- nitrates 0.0 ppm
- nitrites 0.0 ppm
- ammonia 0.25ppm.
The water is clear and my koi once again dead! Can anyone help me out with this issue? I am annoyed and frustrated. I had some of my koi for more than 7 years and I hate the fact that my pond remains empty and every time I try I seem to kill my fish.