I know what you guys are getting at, basically you feel there's an acceptable level of clarity and until you go below that you don't feel it's worth spending extra money, don't get me wrong I get that. However to say it doesn't make as big of a difference is misleading. Staphire glass uses less iron and as a result is clearer by a certain percentage, lets say 25% for example (not sure on the exact amount). So regardless of thickness you're increasing your clarity by 25% and I think any size tank would benefit from that not just large ones. To me it's like saying only large trucks would benefit from better fuel efficiency.
In addition colors seen through Starphire will appear more true to life than colors seen through conventional. I built a few smaller tanks with starphire, I think it make a big difference and well worth the extra money. Also in my experience it's a lot less extra money for smaller tanks, even when you compare percentage wise but that may depend on the supplier.
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