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As long as your total tank water volume is circulated at least 1x per hour you should be fine. The only problem is that your still not going to kill the white spot b/c it is so strong. And, you have to take into account that the bulbs start loosing intensity from day 1 so thats why I usually size off of the 60% rating.
You said you have a 79g tank that probably has some rock/sand in it so the total water volume is going to be even less than that. If you have less than 75 gal of water then you can drop your flow rate to 75GPH and the intensity will rise to 480,000 when new which WILL kill white spot. If you go month by month and track the intensity you will be loosing about 14,769 in intensity per month. Since white spot dies at ~336,000, you can effectively kill it for 9.75 months. After that point you will be dropping below the required kill rate.
Hope that helps!
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"Don't these silly monkeys know that Eden has enough to go around?" MJK
"Free thinkers are dangerous!"
Serj Tankian
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