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Xenia like dirty water and it is thought the pulsing is relating to flow. The lower the flow the more pulsing. You might want to try to slowly increase your nutrients in the tank and lowering the flow. Also post parameters of your tank in case there is another underlying issue with your water quality.
It’s 119 mg/LI sincerely hope you mean 11.9 and not 119
Anyway I'd aim for 0.06 po4 and 15 or less no3 though
What is ICPAlgae like the same things coral does so probably not if you have never done one an icp test will help with the water contents