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I would avoid sting rays. I have seen situations where a ray has stung a horn shark. Sharks tend to get pretty crazy around feeding time, regardless of specie. You can clip the stinger off, however.
You want lots of filitration and flow. I personally use a sump with bioballs and live rock coupled with a fluidized bed filter. The live rock helps with nitrates and the fluidized bed does not become a nitrate factory like a wet/dry does. You gotta remember these a big messy animals, so you cannot overdue filtration- go big.
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