Scobina is one of the smallest rays on the market. They fetch a good price, and could live in a small tank for a short period of time... But if you seriously are thinking of trying to house a ray for life, you will want to upgrade in the future. I got a Retic teacup ray 3" almost a year ago, and now its atleast double, prolly a 7.5 inch disk. Good healthy female, and she was in a 90 until recently i got a 120 to upgrade to. Couldnt pass up the tank, so i atleast bought more time... You can try it, and you may succeed, but it isnt an easy task to house a Ray for life. I honestly dont think a 125G tank is sufficient for any Ray for life comfortably.
Just my thoughts..