I have had this maxima for about 6 months and in the last few days the mantles haven’t been extending. No big changes in water chemistry. Parameters:
Salinity 1.025
PH 8.1
ALK 9.0
Calcium 450
PO4 .10-.25
Nitrates 20ppm
I could move it to a location with a little more light, but it has been happy here since it was placed.