Nickstock94 Posted February 27, 2022 Share Posted February 27, 2022 Hi everyone, I'm having issues with my koi. We had 5 koi in a 125, 6ft long tank till we could build our pond, which has been running consistently for over 2 years now. So my issue is I did a water change lastnight and after that they were doing great and were pretty active as they usually are after a water change. About an hour after that they started to act lethargic and breathing heavy, more just hanging around than actually swimming at this point. So I started to dig in a little to see if I could spot an issue I might have missed or accidentally caused during my maintenance. Temperature was the same as before I removed water Nitrates were 20-40 Nitrites were zero GH reading between 75 and 150, that's the two colors it's between on my test strop. Chlorine read 0 KH reads between 40 and 80 pH reads about 7.2 Ammonia reads at .5 I typically do a rather large (75ish %) water change on them roughly every week or 2 depending on water quality and clarity. I did use Tetra brand aquasafe dechlorinator which what I've always used. Now this morning when I woke up my smallest koi was floating dead at the surface and another smaller koi was laying upside down on the bottom clearing having major difficulty breathing. I got him out and into my 20 gallon quarantine tank with aquarium salt currently at 1tbsp per gallon to start. My remaining 3 biggest koi ranging between 15in to 12 inch are swimming around fine but still breathing noticeably faster. I have tested my water yet again and my results were as they were lastnight when I initially tested. Everywhere I read online states that oxygen levels are probably my problem, but my issue is ever since my koi showed much of any growth I have always made it a priority to have extra oxygen in the tank. I used to run 3 sponge filters on the tank, I did remove one yesterday when I did the water change, but I also have a large airstone disk that has been running for easily over a month before this water change. I also have 2 of the big tetra whisper double HOBs running on this tank and two smaller ones that I've ran. I'm just confused as to what else could be wrong or what else I should do. I've considered doing yet another water change but I worry that wont help or could cause more issues. So I'm just putting this out as feelers to see if anyone has any advice or experience that I'm lacking. Sorry this was definitely long winded but thanks in advance to anyone who stops to read and/or provide insight. Link to comment Share on other sites More sharing options...
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