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Kind of long but any help is greatly appreciated....🙏🏼

55 gallon
Ammonia was .25-.5 and still is .25
Nitrite 0
Nitrate 5.0
Ph 7.4

I had an ammonia spike. (I’m doing water changes and have added prime)
A couple weeks ago my canister filter started leaking. I had to use my hang on back filter until I received the part to fix my canister. Once the part came I hooked my canister back up but I think I lost some beneficial bacteria in the process even though I put my sponges in the hang on back filter and the rest of the media inside the aquarium. The hang on back filter was a topfin 60. It didn’t move my water as well and my water started to develop an odor which it never had before. 
I have added charcoal and I've done a water change yesterday and today. Today I used some stress coat and prime. 

Yesterday after the water change they all shed their slime coats. They were twitching and shaking their heads(today too after water change). Today I noticed the red streaks, shown in the pics with arrows, which weren’t visible before. The red streaks are in dorsal and anal fins of the 2 koi’s too. The angel in pics #4-6 is looking white on top it’s head. I circled those areas. The 2 koi’s fins have also started to look cloudy/milky when they were completely clear a couple days ago. They are still eating. 

Is this just ammonia causing all the issues or is there more I need to be treating?? Septicemia, Columnaris, HITH? What do I do to save my fish? 🥺


white areas circled- not fuzzy or cottony, doesn’t look dented or like a crater either...

Edited by Dvrich89
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first koi had a lot of red lines which have gotten better but now I noticed round white patches on the anal fin. It’s def not ich. It’s bigger, isn’t raised and not all perfect circles. 🤷🏻‍♀️
the second angel pictured now a small white protrusion under its pectoral fin but on the body. It also has the red lines. 

the last pic is the same koi in the first pic. It’s belly seems kind of sunken in? Maybe I’m being extra paranoid. They’re all eating great. Lethargic acting still. 

ammonia .25, nitrite 0 and nitrate 10-20

I’m still just performing water changes and using prime to detoxify the ammonia. Wondering if I should start a med? 5B88974B-3B61-40AE-B736-0959C9383B5F.jpeg.76de3875fec4e9c0263e6e60d89b6c6e.jpegBA67FDCF-E2D3-4CA5-B295-5B20AC1714F6.jpeg.a13f415d8be14dbe0096c977f67b7b3e.jpeg157E9D2E-59DD-4266-AB5F-873EC771016F.jpeg.c35efc3a259e45431b94d461f263da26.jpegC7ACDAE3-E66C-48FE-85C8-A611605F97B6.jpeg.324b0c42b69e893ab9f62c6082c53e8a.jpeg05290FA9-1B98-4791-B33C-4487AF000AA0.jpeg.cb4ea6de279b9322c1a83b600dee85d5.jpegA1F9D94D-6350-4558-852D-597D8C157D5A.jpeg.35b05ac5e4135c8ffecbecca9a42bf47.jpeg

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Your fish have probably developed a secondary infection I would treat  use maracyn  and API general cure ammonia level are still to high API has an ammonia remover filter media bag you could  try 

Edited by Colu
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@Colu I do have some fluval ammonia remover but my thinking was it would remove the ammonia, starve the bacteria, and crash my cycle. Maybe that’s not the case. 

I have been monitoring my ph and today is the first time I’ve noticed a difference in ph. My tanks ph is about 7.0 and my tap (well water) is about 7.8. What does this mean for my fish? C02C3A09-EEE0-4D75-8126-42AE4C27EB4E.jpeg.d36da713c5427b73aa972e3234c725b0.jpegDA6F8875-78BF-4AF0-8FE7-76D6755654F0.jpeg.c84fb6717c9cbd015da38af3f30e68d6.jpeg

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