Angelfish acutely blind

[Colette]

Hello,  

 

my Angel appears to be unable to see, follow or grab food.  

She stays in one area.  Not obviously running into decor.  Fish is not obviously  stressed.

But, Not greeting me, not attacking cleaning siphon, and  not chasing or eating platy fry, which is completely unlike her.   Eyes are clear. No trauma noted.  
 

anyone have experience with something like this? Acute blindness? 

my plan is to add a tank divider ( coming tomorrow). and keep the other tank mates separate so she has time to find and eat food.  She is hungry.

Angel lives in a 75 gallon tank.  Guppies, neons, platys, 1 vampire shrimp, 1 pleco.  No other angels. 
 

water test- normal parameters for planted tank.  Weekly water changes.  
I offered a brine shrimp block today, stuck it to the wall of aquarium right in front of her. She took a bite, was happy but the block floated away, eaten by other fish.  
 

I cannot add video. File too large. 
 

any advice on blind fish, I thank you in advance!
 

Colette

[mynameisnobody]

Are its eyes cloudy? 

[Colette]

No eyes are not cloudy.  No injury to eyes or body.  Has anyone heard of fish eating root tabs?  Or anything toxic that can cause blindness?  A root tab was exposed on the sand surface.  I have no evidence or observation of this fish eating anything odd.