Ah you are in really good shape with the RO/DI setup already in place.
If you don't want to mess with researching regulators then there are folks in the buy/trade forum that can sell you rebuilt regulators for a few hundred dollars that will be better then pretty much anything you can buy elsewhere. The reason being that the solenoids on the off the shelf regulators are usually not great and the needle valves are sometimes less then ideal. Most off the shelf regulators will come with a bubble counter but given the size of tank you will be using this will not be very useful to you, likely you will want a flow meter instead. I know you said you want to buy instead of diy, but diyco2regulator.com makes it pretty easy to do it yourself because they sell everything you need (minus the used regulator itself) in a kit. But not everyone wants to go down that path, sounds like you have gone both ways so to quote my wife, "whatever sparks joy in your life". :P
Carpeting plants tend to be a lot of work to keep trimmed and looking nice, especially if they cover a lot of real estate in a tank. Your tank is going to be pretty big so yea I get wanting to keep it low maintenance. If you have the patience you could go with something like Cryptocoryne parva. It will carpet, but its going to take a while (like 1 or 2 years) before it grows in really well assuming you plant with decent density to start with. It doesn't require much/any maintenance so it makes it an easy choice given what you described.
For discus you may want to consider going with a blackwater aquascape with a lot of tanin in the water. This is a very natural environment for them but its not to everyone's taste.
If you do commit to going with discus it does simplify your plant choices a LOT because most things won't work with temperatures in the mid to upper 80s basically you are can do lots of different kinds of amazon swords, anubias, and crypts. These are relatively low maintenance plants which sounds like that is a goal of yours. The anubias doesn't grow in substrate so you will be planting that on wood/rocks. The crypts and the swords are easy to grow plants that do go in substrate. I will say the ADA aquasoil is kind of overkill, especially if you are planning an auto-doser anyway, but certainly those plants won't mind. The lights you picked I am not familiar with but a google search says they are each capable of 130watts. This is crazy high overkill for swords, anubias, and crypts so you will need to turn those down a lot. If you run your discus a little colder (lower 80s) it gives you access to a lot more plants but /shrug then you are running them at the lower end of their comfort range.
If you think you might change things up down the road then all of these choices make sense, otherwise you may want to consider inert substrate options. An inert and homogeneous substrate has a lot of advantages when aquascaping long term because it doesn't matter if pieces from one part of the tank find themselves in another part. If you have decorative sand in the front and aquasoil in the back then its only a matter of time before you are picking bits of aquasoil out of your sand. As for the lights, certainly you could use much less powerful (and cheaper) lights then the ones you picked out, but it sounds like you either already own these or budget is not a factor to be concerned with?
You rock, brother! Thanks for all this info you're throwing my way, really appreciate it.
I'm going to look into that diy regulator website. Thanks for the tip. I like the building part, but last time I was scouring ebay for weeks and it was kind of a pain in the butt.
This sounds much easier.
Definitely will look into that carpet. I don't mind the wait. Although I might eat those words 6 months from now.
My thoughts on the soil is this... I figure if I can get the tank setup initially as optimum as possible, it removes certain factors from the equation if I'm having issues.
And I won't have to bother with the doser for awhile, keeping things simpler in the beginning.
I figure as the soil starts to deplete and/or livestock starts taking too much out of the water, I can slowly start dosing. Does that make sense?
As for the discus/plant issues, will probably swing by ADG next week. Having a resource like that locally... can't let that go untapped! haha
Budget.... yeah... so coming from the reef side of the hobby, you guys have it made!!! Everything is so much cheaper. LOL
But even with my reefs I tend to have a buy once cry once mentality and get good equipment from the start. I also would rather overbuild than underbuild.
And to top it off, I'm a professional designer, artist, and photographer. And my wife is a graphic designer, too. So style plays a massive part in EVERYTHING. I don't deny it. How do I pick out a bottle of wine, even? By the label design!!!
So quality, performance, and design are first and foremost. If the equipment has the ability to grow with me, rather than hold me back, even better.
I've been a huge fan of GHL equipment for years. Ticks all the boxes. I won't trust my tanks to any other controller on the market and their lighting has the same build quality and robust/stable software and firmware. Might be overkill from an intensity standpoint, we'll find out. But that's ok since they are so controllable. Again, I'd rather have to turn them down than regret my purchase and wish I got something better.
Speaking of the lights, I'll be showing those in detail. Lots of pics and possibly some videos too.
You don't see them around here and these smaller 4-puck versions are brand spanking new.
I'll be a bit of a guinea pig around here I guess!
I subscribed to your journal because your house looks really cool. Very nice.
You have lots of sunlight coming in. Will that not be a problem about algae?
Looking forward to see your progress.
Ha!!! Thanks. I'll pass that on to my wife.
Yes, sunlight may definitely become a problem. Will have to wait and see. That spot doesn't really get a lot of direct sunlight, but lots of filtered.
We've talked about getting some drapes or other treatment for those, so worse comes to worse we do that.