Hi,
5000 gal. pond 13 years old.
New bio filter PSP 24" Top Mount (Emperor Aquatics.)
Microbe lift PL to seed filter.
Two days later, first thing in the morning I went out to say good morning to my kids. All of my koi are on the bottom of the pond. (I ran in to the house screaming "My baby's, My Baby's!!!!" Their fins are gone!!!!")
I absolutely Freaked out. (Clamped fins.)

Ammonia and nitrites up the roof PH OK.
I was on the phone and Internet trying to find help. Everyone had a different opinion.
All I could think was they might die!!! Live terrible life with burnt up gills. Shredded fins and damaged eyes.
I was concerned about using all these different chemicals.
I was so confused...
I ended up changing water, and changing water, and changing more water. It was like the ammonia got stuck and would not budge?

Used amquel plus ($400 worth.)
Ammonia 2.0 Nitrite over 2.0 PH 7.8 alkalinity was low ppm.
When It hit this point I had to remove the fish. 9:00 pm. Again I freaked.

My fish have more than doubled in size the the 20 months I've had them.
I did not have enough large bins to put them in. I freaked.

Ran to Target and bought a 2000 gal. swimming pool.
Filled it, moved the hakko 80L and disk diffuser from the pond. Added amquel plus, salt and let it "rest" over night. Next morning I drained the pond enough so I could safely remove the koi and place them in the pool (All but 12 ".)
Friday I went to Blue Ribbon Koi. John helped allot.
told me to increase TA 100-120ppm. Bought test kits, more amquel plus and Johns secret weapon K.I. Nitrifer. Got home and put some in.
Next morning I tested and the ammonia was GONE. But the nitrites shot up. SUNDAY morning when I tested Ammonia is gone and the nitrites were lower .25-.50.
Monday I was able to get some sleep I have been up all day and night for 78 hours. I did sneak in a two hour nap. Ammonia great and nitrite holding steady. All was starting to look good till today. My Ph has shot up to 9.0 with the fish and 9.3 with the pond.
My fish and I cant take any more.........
P.S. Another stupid thing I did when the ammonia lowered to 0 in the pond I was having a pool ammonia crises. The only thing I could do was slowly circulate water from pond to pool then pool to pond. So far it is working great. Koi seem quite happy. I am afraid to put them back in the pond in case of another freak out.

My koi's are all quality they may not be show but I did get some nice ones. They are my children.
I can't loose any of them.
Looking at this I see all of the mistakes I have made I am here to learn. Lori