If you're a DIYer, and don't want to spend 10-15 bucks (okay that not too much for an ibtanked tank) you can goto Lowes or Home Depot and get carborundum sanding paper to remove the rough edges or level out the cuts...
Here is a method that easily works (although not what I do exactly):
How to Polish the Edges of Glass | eHow.com
It's easy, takes only a few bucks, and you don't have to wait for shipping!
edit - I feel like I may not have explained well enough, seeing as I've done this before.
You want a fine grit sandpaper, be it carborundum or diamond, which can be picked up at any hardware shop (Harbor Freight, Lowes, Home Depot, whatever), just avoid anything with a coarse label on it. Lay the sandpaper on a flat surface and move back and forth while applying water as a lubricant (yes it can get messy, a bathroom or kitchen counter top is perfect) until your glass is even/smooth. Then wet the sandpaper thoroughly and lightly go across the edges until the burs are gone. It's very easy and shouldn't be something to be afraid of trying...it's never too late to learn something!!!
edit2 - Figured I should put some sort of disclaimer in here,,,
If you have the option of sending your tank back for a new one, by all means do it. If you do not have that option, try this before buying a new one. Just be CAREFUL! Glass is obviously sharp and can CUT you, glass is also fragile, so work slowly. Sand it some then check you progress...you can ALWAYS take more out, you can't add any. Use common sense...be careful and go slowly. Yes it beats spending 15 bucks for a new tank shipped...but if you have a warranty and don't mind waiting, USE THE WARRANTY. I am just giving my opinion on something that can save money and time if you want to try and learn something new. Yes, it's easy, but I have done this before, just go SLOW and you will achieve your goal.
