What could be wrong?

[Donsreef]

Any ideas of what could be wrong with this hammer coral?

 

[Crabs McJones]

Can you provide us with some specs? Water Parameters, lighting, and flow

 

[SuperHaze57]

How long have you had it?

 

[Donsreef]

Parameters i will post later my test time is 8pm
Lightning:
2x AI Primes HD and 2x T5's
Flow:
1x Jebeo CP 40 and 2x Jebeo wp 40

I've have it about 4 months.
I do have an issue with high Magnesium
1500 +

Hammer started shedding about 3 weeks ago.
Tank is 36x20x20

 

[Donsreef]

Very low flow in that corner.