Hello! Nice tank! Can't wait to see the finished product. I have a suggestion about the lights.
I use the Chinese box lights that are VERY good for the price. 165W with COB LED's. They put out all of the light you will need for that tank.
They have two dimmer switches on them, one for the full spectrum light and one for the blue. This feature is awesome because it allows you to adjust the temperature (warm or cool light). The other feature of this light that makes them perfect for your tank is that they daisy chain together so you can add or take away very easily.
They are about $80/light and i would suspect you would need maybe 4 of them. Even if you need 5, a $400 price tag is WAY better than 2000.
The fluval lights are great but personally i don't use their features because I like to run 2 or 3 four-hour photoperiods per day (I turn everything off in the middle of the day for at least 4 hours which allows the CO2 levels return to normal levels when I'm at work. Saves lots of $$ on CO2. Reference Dr. Diana Walstad et al). The built in timer on the fluvals only allows 1 photoperiod so I end up getting a socket timer anyway... I use Amazon Alexa compatible socket timer just to make my life easier.
I have no affiliation with this brand or product, just a happy customer. Most of the 165W box lights are the same, but i put the link and title below for the ones I use. I am pretty sure you will be satisfied with these. If you want anymore info or pics on how mine work let me know!
Phlizon 165W Dimmable Full Spectrum Auqarium LED Light Fish Tank LED Reef Decoration Light for Saltwater Freshwater Fish Coral Reef
Bump: I remineralize with seachem equilibrium. Is the water table where you are from hard or soft? TDS, GH, and kH?