I am not really sure what you are asking, but are you talking about actual front to back bracing, overtop/across the top of the tank?
If so, I can't really comment, not really sure, but if you are talking this, why not a eurobrace? Again, I am no engineer, but can a eurobrace give you the top strength, while keeping the top of the tank open.
My tank is 60X27X27, and I have a eurobrace... Now my tank is much smaller in length than yours, but it works well for me.
Just a thought, get the strength and keep the esthetics.
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Setup: 180G DT, 105G Refuge (approx. 300lbs LR, 150lbs Aragonite)
Hardware: Super Reef Octopus SSS-3000, Tunze ATO, Mag 18 return, 2x MP40W, 2X Koralia 4's Wavemaker
Lighting: 5ft Hamilton Belize Sun (2x250W MH, 2X80W T5HO)
Type of Aquarium: mixed reef (SPS & LPS) with fish
Dosing: Mg, Ca, Alk
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