Yes...I was....I am setting up a sps rearing tank so I want drill a few holes in it but I need it 4 ft long

Is the tank 3 feet long or 4 feet? Standard 50gal longs (4feet) are completely tempered. A 3 foot 50gal is not.

Even the old style hagen 4 fts?

It's a 3 footer. I didn't know there were standard 4 feet 50gal tanks. I thought the typical 4 feet dimensions makes up 55gal.

You're good it's not tempered. I figured it would be three foot because you're right the 4 foot is 55 but sometimes they are still refered to as 50's.

None of the Hagen tanks have any tempered panels. I confirmed this on their web site faq page.

And here's a link to a good way of telling if you're looking at tempered glass. You need a notebook/LCD monitor or any polarized LCD screen (most of them are) and a pair of polarized sunglasses.

http://www.salt-city.org/showthread.php?t=9542