I have a saltwater tank that I bought off of a friend of mine who propagated the coral himself. I've had it for about a year now, with no problems. No changes in chemistries or temperatures, coral healthy, and fish happy. I am starting to see however, the coral is bleaching at the base. What could be causing this? Again, no changes in temp, chems, etc.
1. Type & how long you have had it: Saltwater Reef, 1 year
2. Current lighting & Bulb Age: New
3. Nitrate: 0
4. Calcium: 350
7. pH: 8
9. Temperature: 80