Torch losing color

[Chandlertank108]

I got an indo gold torch about 2 or 3 months ago. Somehow overtime it’s start losing its gold color.
current parameter
Alk - 8.6
Mag 1290
Cal - 420
Po4- 0.09
No3- 15
Dosing ab+ reef energy starting 2 weeks ago, hoping to bring gold color back. Other that that all other torches are doing fine. Just one this particular torch that losing gold color. I heard some people like to blast them on high par to get get most coloration but I not not sure about that. Any advice everyone?
First pict was taken 2 months ago and the last one taken last week.

 

[susan ingram]

I got an indo gold torch about 2 or 3 months ago. Somehow overtime it’s start losing its gold color.
current parameter
Alk - 8.6
Mag 1290
Cal - 420
Po4- 0.09
No3- 15
Dosing ab+ reef energy starting 2 weeks ago, hoping to bring gold color back. Other that that all other torches are doing fine. Just one this particular torch that losing gold color. I heard some people like to blast them on high par to get get most coloration but I not not sure about that. Any advice everyone?
First pict was taken 2 months ago and the last one taken last week.

BUMP

 

[vetteguy53081]

Id do a good water change. Prior to that, what is your salinity and tank temperature?