Twin bar question

hhosurfer

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I have a 30gallon tank. 6 White Mollies 4 Platies and one small cat fish.

The Gold Twin Bar Platy are starting to show Black bust like marks the run from Top fin to the nose. When I first got them it was not there. She had a few babies.

But recently the Mother is showing this black dust. Now the babies are strating to get it. They seem fine but no matter what I treat to water nothing seems to change it.

It almost looks like algae or mold. But non of the other fish have it.

Should I worry?
 

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