I have a planted tank, what is the difference between Thrive and Thrive+? Which should I use?

Thrive+ is designed for tanks with a ph of around 7 or below. Thrive can be used at any ph level. Thrive+ contains 60% more iron and two forms of nitrogen(organic and inorganic). If you have a higher tech tank with a ph of around 7 or below then go with Thrive+, if not go with Thrive.