Power Slash
Soul Eater
Dark Mind
Dark Dance
Abyssal Drain
Carve and Spit

Did I miss any?

It's not an invalid suggestion, as abilities that get modifications by other skills get lit up with other classes. Scholar and Bard both have this effect.
White Mage and MCH do not however.

It's a superfluous suggestion IMO, since it's only 6 skills, and as a tank, you should not be looking at your bar at all, you NEED to be mindful of where you abilities lie, especially on Dark Knight, the one that requires you to be 50 an din the expac to be allowed to unlock.