Anemone dying!!! Need help

[jabels46]

My rainbow bta hasn’t been looking so hot for the past week or so. It all started when I changed the lighting on my Red Sea 50 watt from 100% blue and 10% whit e to 100% blue to 12% white. I noticed my anemone getting longer stretching toward the light for some reason and it just kept getting worse everyday. I tried feeding him and he eats but still looks horrible. Then I come home today and this is what he looks like. Please help.

dkh-1.9
Phosphate-0
Calcium-420

20 gallon Red Sea 50 watt light

 

[Lost in the Sauce]

1.9 DKh?

 

[jabels46]

Is that bad?

 

[SaltwaterGuruNeeded]

Is that bad?

Yes, should be 8-12 DKH, when was your last water change!?