Nice looking Discus, It's cool your excited about your first Discus. They are amazing fish.
I would loose the blue gravel for a couple of reasons, first being it's blue....lol.
Seroiusly a sand substrate would be better due to the way thaey like to graze and blow the food up to eat it. It's very easy to syphon the debris off the top too. Keep the water clean, the environment stable and you should be fine. Keeping the lighting a little on the dim side will also help them feel more comfortable too. Good luck.