Building cube tank

[GreenSpottedPuffer]

Either...21"x21"x21" or 20"x20"x20"

I want to go rimless. I had planned on acrylic but now a friend of mine is trying to convince me to go glass.

What would the thickness difference be?

For acrylic I know it should be 1" but what about glass?

What do you think the cost difference would be? For glass, at least the front would have to be low iron. Acrylic...well its all clear, so thats good.

The upside to glass, is that its much easier for me to work with I guess.

Or anyone know if there is a standard tank out there with similar dimensions? Can't be more than 21" though. No smaller than 18"x18".

Thanks.