Is my hammer splitting or stressed?

[MONTANTK]

A few months ago I purchased a green hammer as a single head and that single head has grown significantly since I got it. It’s always open and hasn’t shown any signs of stressed. I noticed the flesh has receded quite a bit up to the skeleton over time(see white spot in pic). Is this normal for when they’re splitting or is it a sign of stress? I recently had an ICP test and it pointed out slightly elevated silicon, sulfur, aluminum with a slightly low level of iodine, potassium and I believe bromine but nothing that seemed very bad.

Parameters:
Alk- 8.5
Ca- 470
Mg- 1450-1500 (ICP read 1380)
No3- 36ppm (recently jumped from 16

Po4 - .04

 

[blaxsun]

Looks healthy.

 

[Reefstick555]

That is a split... congrats on the new twin.