Black ulcer behind cichlid anal fin

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Plec123

Polypterus
MFK Member
Jun 26, 2009
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North Jersey
Have you tested your water?
Yes
If yes, what is your ammonia?
0
If yes, what is your nitrite?
0
If yes, what is your nitrate?
50ppm
If I did not test my water...
  1. ...I recognize that I will likely be asked to do a test, and that water tests are critical for solving freshwater health problems.
Do you do water changes?
Yes
What percentage of water do you change?
41-50%
How frequently do you change your water?
Every two weeks
If I do not change my water...
  1. ...I recognize that I will likely be recommended to do a water change, and water changes are critical for preventing future freshwater health problems.
Not really sure what to make of this. My largest Aequidens diadema has developed an ulcer maybe 0.4cm in diameter directly behind her anal fin. The ulcer was initially pale and flesh colored but is now black. She has a couple tiny bumps on her dorsal fin that i assume are scars from being torn up by tankmates (long ago removed) but other than that no abnormal appearance or behavior.

Active and eating. Its honestly difficult for me to get pictures because if I'm next to the tank she wont stop looking at me and following me. These were taken after a water change.

Anybody know what this could be?

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