I am going to be running zeovit on my 190 that I am putting water in right now. Just waiting for a couple of more zeo things to arrive that should be here this week. Here is a link to a website dedicated to this.
http://www.zeovit.com/modules.php?name=Jig
A few threads on reef central on this have been closed because it is contreversial (sp). There is a thread on reef frontiers about it that I found quite informative. You'll have to do searches on those sites to find it.