Thing is Dave, growing plants underwater is not so difficult as it might first appear, granted there are some folk who have mastered the finer details of perfection & own pristine tanks but, most folk on here are just happy to see healthy plants growing without nuisance algae.
It does take a little experimenting however, the easy route is - use a pressurised C02 system, make sure the C02 gets into every tiny area of the tank, this is easily done buy using a full length spray bar just below the water surface & pointing at the front of the tank.
Introduce sufficient ferts, easily done with the EI system.
Supply enough light but think about using less light rather than more light to get good growth rather than algae, two tubes the length of the tank is fine.
50% water change a week once the tank is stable & perhaps additional water changes durring the first few weeks.
Those are the basics required for a hight tech planted tank with perhaps the C02 distribution being the key factor.
If you use an inline atomiser, these devices will produce a zillion micro bubbles that will clearly show the water movement within the tank. These bubbles really help when you start off & I would recommend using one before you go down the reactor route. (reactor don't allow the C02 to be visible in the tank & offer a much clearer view of the plants & fish)