Electric Yellow Labs chasing each other, help!

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I just got some new Electric Yellow cichlids and the guy at the fish store said he couldn't be totally sure if I was getting a male and two females. One is definitely a female because she has eggs in her mouth, and one is definitely a male. The other I'm unsure of, but the bigger male appears to be chasing it around a bit. Did I get another male? Ill have to go take it back if I did. The attached picture is of the unknown fish.

 

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The big male likes the back secluded area of driftwood and seems to be chasing the female out of there as well. Is this just because they're getting used to the new tank?