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  1. #1
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    koi with black spots

    Hey so i have Comets in 2 different tanks they came from the same place (bait store) and last few days 1 fish from both tanks have started getting a lot of black spots. what i have read is that it might be ammonia burn? but 1 out of 10 has it in my 45 gal aquarium and 1 out of 40 in the 250gal FT. a little help?
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    always allow room to grow, you can always cut it shorter, but cant cut it longer

  2. #2
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    Re: koi with black spots

    does not look good!

    what are your readings? ph, ammonia, nitrite and nitrate?

    have you salted?

    have you done a water change?

    what are your volumes? ft, gb.. any extra filtration?

  3. #3
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    Re: koi with black spots

    This fish is in a 45 gal aquarium.. With a rena filter.. Have don1/3 water change. The other is 250 ft with 55 gallon biofilter then a55 gal clarification barrel. Then into 225 gallons of gb..
    always allow room to grow, you can always cut it shorter, but cant cut it longer

  4. #4
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    Re: koi with black spots

    I will check levels as soon as I get home..
    always allow room to grow, you can always cut it shorter, but cant cut it longer

  5. #5
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    Re: koi with black spots

    It may be just the photo, but the fins are burned on the closest one and the one behind it has a whitish film on its body. This is real common with feeders they have been shipped in super crowded conditions and it could be chemical burn, bacterial, or fungal. But if it holds true it will move very fast.the problem is you can not use chemicals because you want to produce food.

  6. #6
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    Re: koi with black spots

    this has developed after 2 weeks of them being in the tank.. i can use chems in the aquarium, i am not producing from it.
    always allow room to grow, you can always cut it shorter, but cant cut it longer

  7. #7
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    Re: koi with black spots

    great, you're lucky, furazone green works well for many different things.
    if it appears to be parasitic use Clout.

  8. #8
    Moderator JCO's Avatar
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    Re: koi with black spots

    Typical symptoms of goldfish and koi diseases. ... BLACK SPOTS The most common cause of black spotting on fish is transient ammonia spikes.

    Black spots in goldfish, koi , and other coldwater fish often occur as a result of ammonia surges in the water. The black spots can appear on the side or back of your fish. Frequent partial water changes will help to correct this condition and the color on the goldfish should return to normal within a few weeks.

    I raise KOI so, take it from one who knows.
    JCO
    Irish eyes are always smiling but
    • "In the eyes of the world, you are only as good as your last success"
    so never forget
    • "MAN IS ONLY LIMITED BY HIS IMAGINATION"

  9. #9
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    Re: koi with black spots

    in the AP FT the levels are

    ammonia .50 kinda high
    ph 6.0
    alk 40
    hardness 75
    Ni 0.5
    Na 0

    any help with my new system is helpful.
    always allow room to grow, you can always cut it shorter, but cant cut it longer

  10. #10
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    Re: koi with black spots

    Poor guy died in the aquarium.. The one in the ft its still alive
    always allow room to grow, you can always cut it shorter, but cant cut it longer

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