Well, it's a judgment call. Personally, I think, if it's a reef tank, you might as well go for it, so long as you can afford it. If it makes the difference between having a tank and not having a tank, then don't sweat it. But otherwise, I highly doubt you'll find yourself, down the road, assuming you did get low-iron, saying something like "Darn, this tank's glass is entirely too clear, what a waste of money."
If you're looking at 1/2" glass, you can totally tell a difference between regular and low-iron. Regular looks green in comparison.
On a (comparisonly) low lit tank like a FO, it's probably overkill. But on a brightly lit tank, it might be worthwhile. I think you can tell a difference between low-iron and not-low-iron glass on a reef tank.
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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