After my angel taking an instant dislike to my new BN Pleco I changed the way the tank was arranged as advised and everything has calmed down now. Angel now just spends her time stalking him. She no longer bites him but it is funny to watch her get low turn on her side and look under cave like rocks and every other place she thinks he could hide. He does not even notice her just goes about his business eating.
30 gal Freshwater
1 young Angel, 6 Pepper Corydoras, 5 Harlequin Rasbora 1 Bristle-nose Pleco