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Anchor worms or fin tear or?


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I’m not sure if it’s an anchor worm because I’ve had goldfish in the past (5/6 years ago probably) and they’ve had anchor worms so I know what it looks like. But with this I’m confused. In the second photo you can see it right in the center. It’s coming from behind the tail, not on the tail/fin directly, but behind it so it overlaps the fin.

Did he just rip his anal fin or something similar? And what can be done about this?



  • 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? = 26 Gallons, running for a week.
      • * What is the name and "size of the filter"(s)? 240 GPH
      • * How often do you change the water and how much? Currently once a day at 50%
      • * How many days ago was the last water change and how much did you change? Yesterday, 50%
      • * How many fish in the tank and their size? 1 Small Ryukin, 3 inches
      • * What kind of water additives or conditioners? None
      • * What do you feed your fish and how often? Goldfish floating pellets (soaked and pressed), once a day
      • * Any new fish added to the tank? No
      • * Any medications added to the tank? No
      • * 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.? Sitting at the bottom most of the time. I think mainly due to water because I didn't cycle the tank prior to buying him. But doing water changes daily to keep toxicity levels down.
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