thats not a cortez for sure.. its a cali ray .. my two looked just like it! i got rif of them because the y need cold water to survuive.. sure they did well in my system atre like pigs but did not strive do to the higher temps in my tank..with that said a great ray but mine were very large and as said once he grows a bit more your going to have alot of trouble with him int he reef.. cali's love to swim mid tank and "graze" over the tops of the rocks knocking all of your corals over,, also when they at night " think they are feeding" int he wild they will always blow air intot he sand to try to dig up crustaceans so he will soon start to dig holes once he is comfy in your tank which you might hate...
any other question s just let me know