What are the black smudges on my fish and how do you know if your cichlid has changed its gender?

I was wondering what the black smudges that seem to spreading are?

Is it a sign of gender change, maturity, or is it fish cancer?What are the black smudges on my fish and how do you know if your cichlid has changed its gender?
The black marks could be ammonia burns.What are the black smudges on my fish and how do you know if your cichlid has changed its gender?
This is impossible to answer, because you didn't say what kind of cichlids you have.

There are around 2,000 different species of cichlids, and various subspecies, distinct populations, and color varieties within many of the species.



Black or dark smudges are normal on some cichlids as they mature. Again, it depends on what species and color morph you have.



Sex change has been documented in a few cichlid species, but it is rare or nonexistent in the majority of species.

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