I'm about to order a 90gal tank from a man that makes them about an hour and a half from where I live, He sells the 90gal long with the regular glass for 150.00 and the 90gal long with "low iron glass" for 265.00. I cant figure out why it would cost so much more ?? he said the only difference is that the low iron glass is clearer than the regular and that the regular glass has a slight green tint to it ? does anybody know if it would be worth the difference in price or is it a wast of money?any info would be appreciated.