Problem with corals

[1bigstud]

Lots of great suggestions,
Last I checked my nitrates were fine,
Never tested for copper
if I do have copper in my tank how do I get rid of it?
all my fish, hermit crab,mushroom and baby star seem to be doing great.
I think I will take a water sample to the lfs and test for everything possible.
Also I will move forward with the water changes every few days.