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Black Coloration Disease

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Help my oranda goldfish started showing black colouration under its head. I'm not sure if this is normal or should I start treating it for black smudges.
20 gallons tank, 2 oranda goldfish, 1 platy and 2 nerite snails, tanks is cycled, 40% water change every week, saki hikari is their main diet and some spinach, I dont know the ammonia levels since I  dont have a test kit. Fish is still active and eating.




Edited by bubblessakura
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hello and welcome to Kokos :) so that we can assist you, you will need to provide answers to the following questions.


Please copy & paste fill the following form and fill it out to the best of your ability when requesting help for Goldfish Problems:

  • Test Results for the Following:
    • * Ammonia Level(Tank)
    • * Nitrite Level(Tank)
    • * Nitrate level(Tank)
    • * Ammonia Level(Tap)
    • * Nitrite Level(Tap)
    • * Nitrate level(Tap)
    • * Ph Level, Tank (If possible, KH, GH and chloramines)
    • * Ph Level, Tap (If possible, KH, GH and chloramines)
    • Other Required Info:
      • * Brand of test-kit used and whether strips or drops?
      • * Water temperature?
      • * Tank size (how many gals.) and how long has it been running?
      • * What is the name and "size of the filter"(s)?
      • * How often do you change the water and how much?
  • * How many days ago was the last water change and how much did you change?
  • * How many fish in the tank and their size?
  • * What kind of water additives or conditioners?
  • * What do you feed your fish and how often?
  • * Any new fish added to the tank?
  • * Any medications added to the tank?
  • * List entire medication/treatment history for fish and tank.Please include salt, Prazi, PP, etc and the approximate time and duration of treatment.
  • * Any unusual findings on the fish such as "grains of salt," bloody streaks, frayed fins or fungus?
  • * Any unusual behavior like staying at the bottom, not eating, etc.?

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Water temp: 25 C; Tank: 20 gallons, cycled for 1month then added 1 platy, added the goldfish 1 week after. Added 2 nerite snails 2 days ago; last water change 40% was 2 days ago; used anti chlorine before adding the water then added seachem stability; no medication; no frayed fins or white spots. The fish is active and eats well, fed 2x a day 2 pinches of saki hikari per fish.

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Would you mind pasting it into the form and including all the information asked for, please?  We refer back to it during treatment and the more complete it is, the better we can help you :)


Testing the water is also extremely important, we really need to know the levels in the tank before fresh tap water goes in to give us a good idea of the tank chemistry, and we need to know what the tap water is doing so we can compare the two.  If you don’t have a test kit, API’s freshwater master test kit is inexpensive and very good :)



Edited by Arctic Mama

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Please read our guidelines for healthy goldfish.  You will see that you need a larger tank and more water changed to maintain good water quality.

What did you do to cycle the tank during the first 4 weeks?

A cycled tank has zero ammonia and zero nitrite all the time.  How did you determine the tank was cycled without a test kit?

A goldfish develops black spots when a wound or burn heals.  Most often these spots indicate ammonia burns.

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