Afican butterfly fish

[Sidman24]

Are they aggressive?? I have read mixed reviews. Some say they are as peaceful as can be and others say they are mean. I want to put one ( two? ) in my 30 gallon tank. I have a school of tetras and cories there now. Thought about added an angel and guppies

 

[Fishforlife]

Angle eat guppy since my angle fish kill all my adult n eat the baby guppy head off. My angle fish is te size as a half quarter