Never ever, did I say never, add anything to your tank unless you first have a good test kit for that particular substance and use it on a regular basis to demonstrate it is deficient and needs supplementing. Have test kits for each and every ingredient in a supplement or additive, not just the main ingredient. Do you know your calcium, alkalinity, magnesium, ammonia, nitrite, nitrate, pH, salinity and temperature levels presently? Post the readings and someone should be able to help. What do you have for lighting and water movement and what are your temperature swings like? Do you have any mechanical filtration and if so how often do you service it? How often do you change water, what salt mix do you use and do you make sure to match the temperature before adding the new water so you don't shock the system? Adding supplements often hurts a system much more than helps since it throws the balance off and its hard to get it back in check. I add nothing to my small systems and only use a calcium reactor on my large systems and have massive coral growth in all of them.