A 5' long tank is tricky to light. Personally, I would look at a lighting system with 2 x 250w SE going lengthwise to give the most coverage. DE lights are more focused & don't have good spread compared to SE.
I have a 4' & 6' Aqualight Pro & love the all-in-ones, but they are over a 4' and 6' tank, respectively.
At 20" deep, you could get away with lower wattage but not sure if you're going sps or what?
Anthony
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