Angel devouring BTA

[Aronsaquarium]

Has anyone else had this issue?

My Queen angel has decided that my BTA is tasty
Never had an issue when I had my condy.

Is this normal behavior?

My current attempt at protecting him

 

[Stealthreefer]

I have a tang that eats softies that don't have calcium skeletons.
The flower anemones knock him for a loop if he tries nipping them.