Gill flukes, a parasite? Someone help.

[Alyssanece18]

Hi everyone. I have a 75 gallon freshwater aquarium. In my aquarium I had 5 koi angelfish, a blue gourami and 3 Cory Julii. Just recently after getting back from vacation I experienced a ammonia spike. The ammonia spike ending up killing two of my angelfish. I immediately started performing water changes. It’s now been a few weeks. And I noticed another problem. My angelfish have black spots, one has been gasping for air and they rub themselves against the glass. I was told that it’s black spot disease and I got handed a treatment called Bifuran+.

After three days of treatment I haven’t noticed any changes in my angelfish. But my Corys were inactive and hiding a lot. I decided to stop the treatment and I put my {edited to} carbon back in and started to perform water changes. Two of my Corys passed away in the process. I’m not sure if it’s from the medicine or something else.

My last Cory is doing fine, he’s swimming around, active, he appears to be eating. My three angelfish and my blue gourami are active and are eating. I feed them blood worms and flake food.

I just need some help to identify what’s going on with my angelfish before I try any other treatments.

The temperature in my tank is 78.
Ph: 7.5.
Gh: 30.
Nitrates: 0.
Nitrites: around 3, I’m still bringing it down. I’m going to attach some photos of my angelfish.

Someone please help me.

 

[Autumnsky]

Nitrite should always be 0 or it is toxic and deadly.

Keep doing water changes until it is 0.

Nitrite Poisoning - The Free Freshwater and Saltwater Aquarium Encyclopedia Anyone Can Edit - The Aquarium Wiki


In the medication it has these directions in the one I just looked at, did you do the pwc's during the treatment and redose each day?
https://www.hikariusa.com/water_quality_folder/bifuran.html
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[Alyssanece18]

Nitrite should always be 0 or it is toxic and deadly.

Keep doing water changes until it is 0.

Nitrite Poisoning - The Free Freshwater and Saltwater Aquarium Encyclopedia Anyone Can Edit - The Aquarium Wiki

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

In the medication it has these directions in the one I just looked at, did you do the pwc's during the treatment and redose each day?
https://www.hikariusa.com/water_quality_folder/bifuran.html
.
.
.

I went on Facebook and posted the same thing. I was told either my cycle crashed or it was never cycled.

I did do water changes during the treatment and redosed. I didn’t see a difference with the medication.

I did some more research and talked to a lot of people and they said the black spots are just markings. Someone told me there were two different types of black spot disease. One that comes from a bird and one that comes after an ammonia spike.

I have been doing 50% water changes every two days and I just bought a cycled sponge filter off of Michaels fish room and put it in my tank.

Going to check the nitrites and nitrates right now and do another 50% water change and see if anything helped

 

[Autumnsky]

Sounds good.

These articles are good to help.

Also the one in my signature is a great one for basics and to have for referring back to.
https://www.aquariumadvice.com/i-just-learned-about-cycling-but-i-already-have-fish-what-now/

https://www.aquariumadvice.com/fishin-cycling-step-dark-side/