Urgent : koi female betta losing scales

[Tyler777]

One of my koi female bettas is missing several scales. In the pic if you look at the white parts on her body n head , there used to be scales in there.
My wife zoomed in with her phone n kinda looked like her scales were taken off like an attack or something.
Anyone has any idea of what can be ?

Tankmates include 4 other girls, neons, corys, yoyo loaches n one 4 inches pleco.

She is also not moving much, not eating n goes up for air n then goes down to the bottom n stays there for a while

 

[Innesfan]

I encourage you to separate the girls. All sororities eventually fail unless the fish were from the same spawn and never separated. If not, they get picked off one by one until you are left with one.

 

[jaylach]

I encourage you to separate the girls. All sororities eventually fail unless the fish were from the same spawn and never separated. If not, they get picked off one by one until you are left with one.

Totally agree even though I don't do Betas. Betas are predictors even though they don't look the part. They are also very territorial. You just can't keep a group in the same tank.

If you had a tank of 2 hundred gallons you could probably get away with multiples but even a 30 gallon tank is really too small for multiple betas.

 

[MaloK]

Can you post more pictures...

It's difficult to differentiate what is in front of the fish from it. Different views would help.

But, what is that white stuff on the gills and head ? I sure hope it's on the glass.