torch bleaching

I’ve had an Aussie gold torch in my tank and has been doing fine till about a month ago. It went from Golden with purple tips to a pale yellow with white tips. Parameters: Ca- 430 KH- 8.5 PO4- 0 No3- 10 Mg- 1300 Lighting- 10x54 T5. Par at coral height = 210 Spot feeding 2x per week with -...

So not sure what it could be, but my torch started losing color and looks to be bleaching on one side. Any ideas? The tank is a JBJ45 running a Hydra 52 about 12" over the tank. I just turned down the intensity on my setting because I feel like my settings might be too high, now peak is now at...