I agree good planted tanks are harder than reef tanks. Low tech works but they dont look like that!There is no such thing. Excel is carbon source. Period. If you "make" your own Co2 set up dialing it in is the hard part. Each tank is different. However a good starting point is 1.0-1.5 ph drop from lights on to lights off. That's a starting point. Consistency is key or your tank will be over taken with algae. Then what are you going to dose? Tap, EI, all in one? It's a balance. If you add CO2 you want to up the lights. I use Kessils with T5 because kessil is garbage on it's own. Yeah I said it.
Soda water...I mean I guess, but really? LOL!
Anyway low tech is a lie. Good luck in what ever you do. Planted tanks are much harder to get right than reef. Nevermind I fail at reef tanks. Here is the 45 JBJ. Debaffeled using canister filtration. SB REEF planted on like 35%.