Either way is fine, but a lot of growers like to have a feed tank for the nutrients with just the Grow/Micro and Bloom (and maybe an additive or two) and another tank for the supplements etc.

Usually you feed 3-4 times a week, whereas you only add supplements 1 or 2 times a week.

In the end it comes down to what works and is convenient for you, or seems to work better for the plants. If you have the time - two tanks give you more control.