My torch coral has lost one branch and dont know what issue is. Any ideas what black hole or spot on stems could be? All parameters are good and I do weekly 10percent water change. Doing dosing weekly with cal/mag supplements to keep at 400-450 on calcium. I have two Chinese black box lights on lower end of intensity and glass lid on my 75 gallon tank. Thanks for any advice as I am new to the Hobby. Will try and figure out how to post picture.
Warren
Warren