When starting any reef tank, testing your water conditions are beyond important. Also, it is a really, REALLY good idea to make sure that you test these levels fairly regularly. No, not once in a while, I mean all the time. I typically test my water levels at least once a week. When we were in the beginning and really cycling the tank, we tested it several times a week.
When you jump into saltwater tanks there is a million dollar question: “Do I want an all fish tank, or do I want a reef tank?” Reef tanks offer some BEAUTIFUL corals, anemones, clams, etc. “All fish” tanks offer the super exotic fish that don’t necessarily play well with corals and invertebrates or each other in some instances.