Green birds nest turning brown

[uutank]

Almost a week ago I dipped my BN as I suspected some pests on it. The next morning it completely turned white purplish, with no PE at all, I left it as it. After few days some polyps have come back. This morning I noticed The tips have started to turn brown. Since there was no PE on the coral I was feeding it every alternative days it did helped imo as some polyps came back.
Cal-440
Alk-8
Nitrate-0
Ammonia-0
Phosphate-0.25
Please reefers help me out!!

 

[saltyfilmfolks]

What did you dip it in?

 

[uutank]

A Bayer dip

 

[najer]

Do you have before and now pics?

 

[uutank]

Before

After

I think it’s dead, the brown thing is algae taking over it. Only on the far left side, there’s PE.

 

[Hemmdog]

Oh no :( yea it’s dead

 

[uutank]

[emoji22]

 

[uutank]

Guys. I can see very small polyps still on the died part. Should I keep it or throw it.
Under actinic the green polyps are much more visible, it looks like that the polyp is not out of the tiny holes but the holes are green, the polyp just trying to come out.