I like selection of plants and you have some awesome driftwood!!! Just a couple of suggestions - Instead of equally spacing the driftwood across the length of the tank maybe you could bunch some of them closer together on one side or the other for some imbalance - looks a little more natural. Also, that that thermometer is a bit unsightly.
Congrats on your mated pair of discus. I wish I had room for a 125. I currently live in an 800 sq ft. condo. I'm jealous.:icon_smil
Wow. I love it. I like the background black and the bright green plants with the blue fish. I like the back near the right side. The very right corner is throwing me off a little. It just looks like it's not finished or it needs to grow in.
Since you have ground cover on the right I thought you were going for a left angle scape. I find the grass on the left conflicting. Wish it was more towards the ground cover and then tall plants on the left side.