Definitely males.
Remember, male jack dempsey cichlids have specks of blue ALL OVER their body. Males do not have splotches of powder blue on their face like the females. For example.
This is a male below. Notice how this male has less blue on its face.
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Here is female. Notice how she has a lot of blue on her face.
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Here is a pair. Female on the left and male on the right.
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