I just looked at it, and I've noticed a pattern where it opens up more near the end of my light schedule. I'm wondering if it likes the less light. If it's closed up tomorrow, I'll move it to a shadier area.
Thats strange. Parameters seem good with MAG jus a tad high.
Personally, they prefer or I should say do best under moderate light and water flow , feedings 2-3X per week.
Temp range 77-79
salinity 1.025
CA 450
Mag 1300
alk 8-9
ph 8.1-8.3
I dont even feed mine and its the size of a football