Zeovit is a process developed by a german guy named Thomas Pohl and consists of getting your system into ULNS mode and dose a set of additives to enhance growth, color, quality, etc... Some people say the additives its just snake oil but I disagree.. Before going zeovit, some requirements are to have strong lights, strong skimmer, run carbon (mesh bag or reactor), stabilize CAL, ALK, MAG, PHOS & Potassium (K).
These is a good example of a great zeovit tank: http://reefkeeping.com/joomla/index.php/current-issue/article/139-tank-of-the-month