My hammer corals heads are falling off

[THE_Big_Cat]

Came home from a weekend trip and found my hammer corals heads have fallen off, not sure what to make of it when I tested the water everything came back well within range beside my magnesium which was at 1210, could this be just stress from letting parameters slip or am I possibly dealing with an infection

 

[BudgetR33f]

It could be brown jelly disease. I'm not sure though, just throwing out ideas