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Goldfish finrot

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  • Regular Member

Hello.I have a 45 g tank and 2 goldfish.I had a problem with algae i think the light was to powefull and i changed 75% of the watter scrub the aquarium and washed the filter.The next day the watter smelled very bad and the fish were in terrible shape.Now i have them in quarantine with sera omnipur.The black moor has some scales missing and is in bad shape.They eat and they are active.Will they be ok?And what do i do with my aquarium.Do i start the cicle again?i also have a ancistrus but he is ok












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  • Helper

Hi! I realize you have answered some of these questions already, but if you can please fill out this form it will make it a lot easier for us to help you :) A full tank picture could help as well :)

  • 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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  • Helper

Just from a quick glance the nitrite needs managing.  Keep it at zero or as close to zero as possible with water changes, you may need to do one or two complete changes per day. Your test kit will help.


As Mandy said, we need some more information to best help you, so please fill out the form completely :)

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  • Regular Member

No test for ammonia 

water temp: 27 degrees

tank running for 2 months

I change 30 % twice a week

Last water change a day before the problem(2 days ago) 70% water change bcz of algae

fish size aprox 4 inches

i use tap water with sera toxivet

i feed my fish twice a day sinking pellets and once a week peas

fish added a day before this happened ancistrus-4-5 inches.

Fish are like in the photo but now in the new tank they stay at the bottom but eating.

is my tank still cicled?I did today 30% watter change it still smels but not like yesterday

i tested it again and 



Do i do a 100% watter change and clean the filter.I have easy start that i can use






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  • Admin

What kind of filter is on this tank? 

I see you have two tanks which tank are these guys living in.? I also see some zig zag poop on the last photo.


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  • Admin
1 hour ago, Angy said:

The filter in diversa claro 1000

Thats an internal filter. Those filters don't work well at all for goldfish. I do believe this is your big issue in this tank. Those filters can build up bad bacteria really fast and it can cause fin rot. I would highly suggest a Aqua filter 70 or two 50's :) 

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