If you are talking about the ones that are like a hand's width from your collarbone down then you don't have to. But if it's a boring color or you want to make it more stylish then yeah! Wear a bright-colored tanktop!
ie. A white v-neck with a blue, pink, purple, green, yellow, grey, orange, red, or black tank. Or just any color because all colors pretty much stand out against white.
But if you're going to wear a tanktop then make sure it sticks out a little bit at the bottom of your shirt!