250W Metal halide too close to Sea Swirl?

[FrankB1]

I want to mount a sea swirl on the back center of my 20 long but this will put it under a 250W MH hanging fixture. Will it fry the sea swirl? The light will probably be approx 6 inches from the swirl. Or should I mount the swirl closer to one corner?

 

[Entropy]

I would mount it closer to one corner or just shield it with a piece of black abs or something.