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They do not appear to be L. curviceps. The caudal pattern is wrong for this species. To me it appears to be one of the larger Laetacara species. How large are the fish and how old do you think that they are? BTW not all L. dorsigera show a red breast. One population is mostly black in brood care.
how about thayeri? or flavilabris?
the vertical barred pattern might be showing because of your tank's dark gravel and surroundings -- I dont think it's stress.
Did the previous tank where they looked "clear" have a lighter colored bottom and less shelter (wood, plants, rocks) ?