Can Anyone Tell Me Why My Corydora Is Dying?

Discussion in 'Freshwater Fish Disease' started by Ariel4891, Apr 14, 2018.

  1. Ariel4891Valued MemberMember

    I went to do my weekly water change today and noticed that one of my Cory's was in the corner of the tank, on his side, and gasping for breath. I immediately took him out of the tank so I can get a good look at him. This is what he is looking like. 20180414_091007.jpg

    His eyes look like they're bulging, and one looks like it has a bit of blood in it. He is also slightly bloated and his gills do not look good. None of the other Cory's are acting like this. I am doing a 50% water change right now but I don't know what to do. I just tested my parameters and they all look fine. I'm posting the photos because my comparison sheet has been lost, but from the pictures I can see on the internet they look okay.
    I have eight corydoras in that tank, three of them are larger from a previous tank, and five that I had bought and quarantine. They have been in the tank for about a week now. One other corydoras does look kind of big, but I had been assuming that she had eggs. I recently dropped the temperature of the tank to 75 degrees. Could this has caused anyting.? I did it over a period of a couple days so I didn't think it would be a problem.

    Can anyone help?

    Here is a pic of the big corydora 20180414_092604.jpg

    Oh, and here are most of the other ones in a group. As you can see they all look good 20180414_092450.jpg
    Last edited by a moderator: May 4, 2018
  2. appcontrolWell Known MemberMember

    Pop eye or cloudy eye usually show up when the water is less than pristine. The best course of action for anything of that nature is fresh water. Bloating usually show internal problem (parasites or constipation). If you have quarantine put him there if not or even if you quarantine him do 50% water change.
    Hard breathing is sing of ammonia or nitrite or could be some gill parasite etc.

  3. Ariel4891Valued MemberMember

    I do have a quarantine tank, but when the corries we're done quarantining I put some serpae tetras in there. Can I put the cory in there as well? I have an empty 5-gallon tank, but no cycled media to put in there.

    Should I start dosing the tank with paragard?

    And also, I did the 50% water change so is it better just to put him back in the tank Since I don't have a QT for him? And then go sit with the paragard?
  4. appcontrolWell Known MemberMember

    For any suggestions for medications i would wait for more experienced aquarists because i am not sure it is smart move now. I would monitor him for day or two maybe try with clean water and immunity buster in first hand and then as last option use meds beacuose it could stress him even more and you will get opposite effect.

    And do you want to move him to qt with tetras. I am not sure, there is chance they will terrorize him so that would be more stress.
    Last edited by a moderator: May 4, 2018
  5. TexasDomerFishlore LegendMember

    I'd put him in the 5 gal, add a filter, and start treating with an antibacterial. I would not treat the main tank. He'll be fine in the 5 gal, just add a thin layer of sand (better for their barbels than being on barebottom), treat, and do large and frequent water changes as the meds allow to keep water quality under control (use Prime on days when you can't do water changes because of the meds). Don't worry about feeding him - it'll be better for water quality if you don't, and it won't hurt him to go a week without food.

    Dropping the temp was a good idea - I'd even go lower. Peppered cories need low temps, 74 F or below. Higher temps will cause problems.
  6. Ariel4891Valued MemberMember

    I'll do that then. I have a spare AquaClear filter that I can put in there. And all fast him for about a week while I medicate
  7. TexasDomerFishlore LegendMember

    Fingers crossed he gets better!

    Paraguard isn't a antibiotic, by the way. I might personally go for a mix of erythromycin and kanaplex.
  8. DoubleDutchFishlore LegendMember

    It probably is an internal (bacterial) infection causing a build up of pressure inside the body (dropsy) : the eyes are bulging. Not a lot you can do I think.
  9. Ariel4891Valued MemberMember

    I have kanaplex. I'll use that then

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