120 goes crack!!!!!

thats true for manufactured "reef ready". thats why a naked 55 costs 130$ and a naked 55 reef ready is 300$

 

I know that, I was discussing drilling a tempered tank in general. Also, the tank we are discussing is not tempered. The glass bottom would of shattered into a thousand pieces vs the crack going from the overflow box to the other side of the tank.

 

How to temper glass

I found this process on the web, thought everyone would enjoy.

Step1
Shape or drill any holes in your glass before tempering. Once your glass is tempered it cannot be cut or drilled without shattering into small thumbnail-sized pieces.

Step 2
Heat the glass you wish to temper to a temperature of at least 600 degrees Fahrenheit in an oven or a kiln.

Step 3
Remove the glass from the oven or kiln (carefully, using tongs or a special paddle made for handling hot glass) and set it on a brick or cement surface and allow it to cool quickly by fanning it with cool (but not cold) air. It is the quick cooling of the outside surface of the glass that causes the molecular changes that make the glass tempered. Allow the glass to cool completely.

Step 4
Check to see if your glass has been properly tempered by looking at it with polarized glasses and shinning light through it. Tempered glass will have patterns of shadows (sometimes called "quench marks") visible with polarized lenses.

Info provided by: How to Temper Glass | eHow.com

 

sweet thanks for the info John.

 

No problem, glad you liked it.