With a decent test kit for trates, tropic Marin, Elos, Salifert......among others you want your trates below 0.5 IF you have stony corals.
If your trates are above 0.5, you'll need to have a system in place, whether large weekly water changes, sulphur, bio pellets, or carbon dosing.
I've been carbon dosing for about 6 years with excellent results....albeit not perfect.....
here ya go!
http://reefkeeping.com/issues/2008-08/nftt/index.php">http://reefkeeping.com/issues/2008-08/nftt/index.php</a>
[IMG]http://www.saltytank.com/viewguide.php?ID=176">http://www.saltytank.com/viewguide.php?ID=176</a>
and here:
[IMG]http://glassbox-design.com/2008/the-vsv-method-faq/">http://glassbox-design.com/2008/the-vsv-method-faq/</a>
That will tell how to start...