I would say 3 at lease but 4 would be better are you going to suplament with any VHO's or T-5s? I would not put a MH over a tank brace if you can help it. I would do 3 lumenarc mini's with 250 MH and 2-4 T-5s' to give you more control on the look of the tank. just my 2 cents btw awesome tank!
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