You're going to want to have as little liverock in the main tank as possible to maximize the sandbed area for the ray so I would say do a large sump and fill it with rock so that you can receive all of the benefits that it brings. With any tank containing larger than normal species of fish you want to have a skimmer that is rated for much higher than the actual system volume because you'll be dealing with larger than normal inputs of food and waste. My skimmer is rated for 400gal for my large snowflake eel even though my tank is only a 120gal (270gal system). I believe you also want a 3-5" sandbed of very fine perhaps oolithic sand as well for the ray to be able to properly burry itself.
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