Let us get one thing striaght here, more light is not better, certainly not for your goal.
4 x 96 PC light can grow anything you might have planned.
Look nice etc.
T5's would be a nicer option.
6 x 39W 90 cm lights would be ideal at 5cm, 30cm and 55cm across the top:
Top view:
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The wide spread will give good coverage, even low light across the entire tank and also highlight the Discus much better(higher light washes colors out more).
Run the out 2 banks for say 10 hours and the middle for 6 hours in the middle.
This will give you 234 watt and plenty of light for most of the things you might wanna grow. Lower light at 156 watt for 10 hors will keep things growing well etc.
You will also have more wiggle room with CO2 and not need as much as you do with higher light.
Nor do you need as much nutrients with reduced light.
This means it's much more manageable!
Easier dosing, less stress for you, the fish etc.
But just a little more paitence and keeping your hand out of the cookie jar
It's really worth it.
I'm not sure if you have access to ADA aqua soil, but if so, it will cost, but will make the tank very easy to grow most things also.
Sand will work also obviously. Also, consider aesthetic white sand foregrounds(easy to keep, no pruning etc).
I'd work out the hard scape and spend a lot of time thinking about what you want there, spend some $ and time getting the materials you really want.
It's a big tank and lots of $, time etc and it will be right in the middle of your home. So take the time to do that right. Chose the fish very carefully etc also.
I've seen folks spend a lot of the tank, then toss in a few rocks and blocks of wood.
Sort of a waste..........
Regards,
Tom Barr