Did you do any research before buying fish? You can NOT listen to local fish stores, they are mostly interested in selling you some fish. Research goes a very long way in this hobby. How do you cycle your tank? Did you use live rock? Did you test along the way ? You are on the right forum here. People here are very willing to help you on this journey, but you MUST do some research first. Unfortunately, many people just j7mp in without any knowledge. Just start over, let us know where your parameters are, and get some decent test kits. I would recommend at least Salifert, Hanna if you can afford them. You MUST test along the way so you can see, first hand where you are in the cycle.