As long as your're comfortable with top-off (maybe go auto top-off) then I'd say Fan only, but it'll cause a lot of evap.
I have dual 250's over 90G and I have built 2 large "ultra quiet" PC fans into the hood and they're controlled by my Apex.
Works great, No chiller necessary. Although to be honest I am thinking of going LED this summer for heat and electricty reduction.
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