1. As stated in previous post, convict cichlids
2. I think its to small for them, from memory the tank is only 620mm wide (correct me if I am wrong)
3. As previously stated egg spots.often means its a male fish, but not always the case.
Side note, dont expect the live plants to last very long. Chances are they will get dug up and nibbled on.
The Cichlids you have should be easy to keep, weekly water changes, lots of caves/territory, good filtration, food.