how deep and long is your tank? That would influence my choice of lights. One metal halide every 2 feet and if it is over 24 inches deep I would think about a bigger wattage of light.
I would suggest 2 400 or even 250 watt MH lights a 175 won't punch too deep but if you budget does not allow a bigger ballast keep all your sps toward the top. You will need 2 lights for sure.
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