It's basically this, copied and pasted from the ASAP forum. Please fill out as much of the following info that you can. Not only will it help us help you, it's good stuff to know about your tank. And will aid in the future health of your tank and its inhabitants..... COPY/PASTE and fill in the blanks..... Just do your best Brief description of the problem. A picture(s) will also help. PARAMETERS (important) Temperature: PH: Ammonia: Nitrite: Nitrate: Salinity: dKH/KH/Alkalinity: Magnesium: Calcium: Phosphate: Test kits you own: Liquid or Strips: Brand Name: Are they Expired?: Tank size? Estimated total system? Reef, fish only or, freshwater? Current inhabitants? What and how many? Clean up crew? How long has your tank been set-up? Substrate. Type? Depth? Live rock? How much? Did you recently add some? Filtration. Type? Protein skimmer? Do you wet or dry skim? Maintenance schedule for filtration? Drilled tank/hang on back overflow? Sump/refugium. What's in it and how much? Macro? What kind? Lighting. Lighting type? Age of bulbs? Feeding What? How much? How often? Water change schedule. How much? How often? What salt brand? Water source? Additives/supplements used? Do you have a ground probe? What kind of flow does your tank have? Any additional info you would like to share.... Including anything different that you have done/not done. Good point Av8Bluewater.