Its definatly a Vieja, but at that size its almost immpossibe to know the species for sure, just be prepared for a cichlid 10" in length.
Wait untill it gets a few inches bigger, send us a photo and maby we can help more. The trouble with Vieja is there are a lot of hybrids on the market, and as the young look the same in most species, recognising the hybrids is hard.
When your fish gets about 4-5", he will be showing most of his adult colour, then you may have a shot at identifing him. Sorry I can't be of more help.