CO2 is god for those aquariums same as the best fertilizers money can buy. Light must also be perfect and those aquariums get tested daily and whatever nutrient is missing is aded. Takes time, energy, patience, money and most of all knowledge combined with the love for the hobby.
Keeping a tank like those is like keeping a very expensive supercar. If you dont have all it takes stick to a Ford, they(fords) dont have the speed, looks or sound of a supercar but they are easy to keep. Cant find a better comparison than that.