rays

I would like to one day have some rays. Is a 12" tall tank good for rays like hystrix. The tank i was thinking for them would be a 72x47x12. It would have 3 females and 1 male. With least 2 40's for quarantine or temporary grow out takes. The wet/dry would have a 12" tower for prefilter and bio...

Is anybody keeping string Rays? I'm thinking about setting up a tank.