I am with Jason here. I have been using ZEOvit for about a year. I have had remarkable results and will be using it until something better comes along. Now that the cost of the products have come down by about 25% it has become very affordable. If you have been lucky enough to have seen Jason's tank you would definitely agree with what ever system Jason is employing. I have seen many very exceptional tanks and I can tell you very few of these Reefers are practising the same method.
Tom R
For costs look at this
http://216.187.96.54/vbulletin/showthread.php?t=35527