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I've had a great deal of difficulty with by acros. I borrowed a par meter and found out that the center of the tank for my Montes are has a par of 300. On the sides of the tank my par reading is less than 200. I'm running 3 250 watt MH bulbs on a 6 ft 220. Can I change out and go with 400 on the ends. Do I have to change the ballast it would have anyone I can try to open for suggestions.