Unfortunately, keeping corals is a little more complicated then keeping fish only. To do it right you need to test just about everything or else eventually something will go wrong and you will lose everything. Redsea has a great alkalinity,calcium and magnesium test kit for about $50. They also have a phosphate and nitrate kit thats i like. It would be a wise investment. Of course then you will have to adjust your water to meet the corals requirements. They do include a small book that guides you to the proper levels.