I'd say that will be okay, especially if you use tempered glass.
If you are building a tank, you may want to check out using Starphire glass for the front panel, as with 1/2" thick glass, the "greenishness" will be noticeable.
You may also consider having your tank professional built if you arent' sure. Glass Cages will build a tank to your specs for you. You'll pay a bit more, but you'll have a warranty and the peace of mind of knowing that the tank is properly engineered.