Why cant i keep my gsp happy?

[Gjedde]

Ive got a 5 inch piece of gsp ive had since may, it was 1 inch long when i got it. It was about 5” in September so i fragged a 1” square off of it. Ever since i fragged it it has had minimal polyp extension, maybe just 2 polyps per sq inch. Previously all polyps were fully extended. I’ve patiently been waiting and once a month or so ill move it to more flow, less flow, more light, and less light. Nothing seems to work. My tank has a variety of lps, sps, and softies that are doing just fine but for whatever reason, i cant seem to get my gsp back to its happy flowing self.
temp 79
Salinity 1.026
Ph 8.1
Alk 9.6
Calc 440
Magn 1260
Nitrate 15 ppm
Phos .03

I would really like to get this coral thriving again but im just not sure why it doesn’t seem happy in my tank.

 

[tbrown]

Have the parameters changed much since you fragged it? I know mine like lower light and higher flow. They also tend to like dirtier water and I keep my nitrates around 30ish. Alkalinity may be a little high but not sure if that affects GSP. Mine slowly went up to 9.8 and I brought it down to 8.3 over the course of a month. Today, my GSP is the happiest I've seen it in a while.

Nitrates 36.8
Phosphates 0.05
Alk 8.3
Mag 1320
Cal 440
pH 8.3
Salinity 1.026
Temp 79.8

 

[billyocean]

Ive got a 5 inch piece of gsp ive had since may, it was 1 inch long when i got it. It was about 5” in September so i fragged a 1” square off of it. Ever since i fragged it it has had minimal polyp extension, maybe just 2 polyps per sq inch. Previously all polyps were fully extended. I’ve patiently been waiting and once a month or so ill move it to more flow, less flow, more light, and less light. Nothing seems to work. My tank has a variety of lps, sps, and softies that are doing just fine but for whatever reason, i cant seem to get my gsp back to its happy flowing self.
temp 79
Salinity 1.026
Ph 8.1
Alk 9.6
Calc 440
Magn 1260
Nitrate 15 ppm
Phos .03

I would really like to get this coral thriving again but im just not sure why it doesn’t seem happy in my tank.

A mag bump wouldn't hurt