First off, is the tank cycled?
The tank seems to be a 37 gallon and the dimensions are very similar to the 37 gal I am saving up for. (Except the height on the one I want is 22.5 inches, not 24 inches)
With a 37 gallon you have a pretty good range of options.
You want a region specific tank, in other words a biotope, (with live plants and fish of the same region)?.
Discus are a good choice, but they need a little more care. Water should be top priority with Discus, so once or twice a week water changes are ideal. They aren't impossible to keep, despite stereotypical belief, they just need a little more care than others.
You could probably have 6 small, young discus and then let them pair off naturally, and keep one pair, and the remaining 4 can be given back to the store or given to someone you may know who wants some.
You like/want Discus and you want a biotope so thne you would have to get fish that would live in the Amazon and co-exist peacfully with Discus.
Discus are really cool, and they would be your showpiece (what better than the kings of the aquarium!

), so then you would have to build around them.
So here's what I would do:
Make sure your tank is cycled.
Add fish slowly.
Some amazonian fish that would be perfect for a 37 gal and with Discus are tetras!.
Some good and peaceful ideas would be tetras such as: Neon, Cardinal, Rummynose, Glowlight, Black Neon (just to name a few).
You could get a few ottos aswell as one bristlenose pleco for algae help.
You could possibly get some cories (a school of 6, and of the same species), but you may have to do some more research on them because some species prefer cooler water.
Always remember that with any schooling fish such as tetras, cories, etc.
You should get AT LEAST 6, if your tank can allow more (and in your case it does) then go for it!
This sounds like an interesting setup!
Hope this helps!
