I have seen many tanks made of "Starphire Glass" which I believe is low-iron. It is extremely clear, not quite as clear as acrylic but much better than regular glass. Only problem is that this kind of glass is somewhat difficult to come across and its expensive.
One place that makes aquariums with this glass is InterAmerican in Canada. I believe the owners' name is Mitch. I've heard this place is quite a crap shoot though with many promised delivery dates not realized.
One place that makes aquariums with this glass is InterAmerican in Canada. I believe the owners' name is Mitch. I've heard this place is quite a crap shoot though with many promised delivery dates not realized.