I just got my 5" tiger oscar today, I felt bad for at the store he was in a 40 gal with 4 larger oscars so I took him home , I have a 2" gold saum/ green terror that will not leave this oscar alone it has been following and nipping at him for almost 5 hours, they lip locked once and I thought everything would be sorted out after but the GT continues to ram / nibble him, what can I do to stop this?