I agree and disagree with what has been posted so far, a friend turned me on to this a year ago, I have a reef withe SPS, LPS corals and fish, and yes I have lost some of each!! Patients is the key, a protein skimmer, fuge, and IMO mechanical filtration is a waste and a nitrate factory. I tested for everything at first, now that I know my system and everyone's take's on it's own chemical personality you will not have to test for everything all the time, unless you see a sudden change and have to find out what is out of wack, and be intuitive, what did I just add to the tank??? Lost some LS due to 2 Cardinals I got from a LFS, dating a lady that worked there, there system crashed that morning, bought the fish at 2, she called me at 3. too late, infected my tank. I test every 2-3 days, nitrites, nitrates, Alk, calc, and check the SQ, which I know by adding make up is fine, habit. Join a local fish club, your LFS can direct you usually. Check out Reef.org it is like this site. I live in Milwaukee, WI and really have 1 good LFS for quality LS. I have found Liveaquaria.com and MarineDepot.com are the best, LA gives a 14 day no question guarantee. Great for supplies too, I have found a 30% water change biweekly does more then a 10-15% weekly, because I have a reef I use Reef Crystal salt, Instant Ocean is more for a fish tank, RC has more of the trace elements and with the size of H20 I do I only have to drip Kalk and some C Balance, to maintain Calc for the corals. Good luck and enjoy. A water change takes me 15 minutes no big deal. If you go reef with corals you want a RO/DI system and get some total house prefilters at your local home improvement center, adds life to the system. IF you drip Kalk that will usually take care of daily make up. Get a basic SW book, read it, read it, and read it, I read my buddies at least 30 times and ha, I broke some of the rules, won some lost some.
Bob