I would say you are no where near to much it doesnt really matter the size of the tank as much as the bulb wattage and how close the coral is to the light.
no it's not too much. i keep 590W over a 92 corner w/ MH and VHO bulbs 10" above water surface. if your tank is not an open top, then that may be another story.
I would look into getting a higher Kelvin bulb instead of the 20K's. They will not be intense enough in my opinion. Wattage isn't as important as the PAR of the bulbs which would be how the intensity is measured. Most 20K bulbs have pretty low PAR.
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