6 will work 4 u couldnt really have and hard coral but the 6 u can half way up. i have a 6 bulb but they are boosted with icecap so they are 85w each. if u want all sps get a 8 bulb. what ever u get get individual reflectors. nova pro 6x54w will do fine or tek but if u want
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top of the line ati or what i have the aquatinics solar flare