Dear All,
Some good news and bad news to share with after adding a sorta trickle tower (the blue drum in the picture, ie P1010571 & P1010576)
Good news
- my green water problem have been solved after 5 days of adding the trickle tower.
Bad news
- My ammonia and nitrite reading (refer to picture P1010581) are really dangerous for koi. However, all my kois react normally and no stress sympton can be seen. Ever since, i have stop feeding them. (They must be hungry

)
Questions:
1. What should we do to reduce the ammonia and nitrite? I have filter out the waste in my first black chamber every day, have reduce the feeding, partially change water once a week.
2. Will the green water problem come back again since my pond is not under any shade?
3. how's the shape of my Momotaro kohaku? over feed?
More pictures to comes... Hi Dafish, How big is your fiber tank?How many kois you have in there?Answers to your questions..... 1)To reduce ammonia and nitrite,do a partial change of water say 25 to 30%.You can also buy a product called "Ammolock" to reduce your ammonia.But also check your testing equpiment,might be old or expired! 2)If your TT and filter are matured and you changing water once a week,do not think the green water will come back. 3)Your kois look thin.Males i think.