Yes Rob they could be cichlasoma or Aquidens Portalegrense .... aka black acara or red port acara. The thing is that when you try to check on the net and see some pictures of the fish, they all look so different than from you have in your tank. Even the colour variation varies from one site to the other although they are referring to the same species of fish...... The internet sometimes gets more confusing then solving the problem ehhhhhh ????
Well I just have to keep looking....... btw they are part of my central american set up.
martin