Yea I know all about her moods (I've had her going on 5 years now). She used to be in my 125 community tank. When she was little she was cool to all other fish, but as the years went by and she grew, her territory grew and her patience with the other fish grew thin. Within the past couple months she has killed 2 fish, but I've always really liked her alot so instead of getting rid of her, I bought and set up a 40 gallon breeder for her. She has been in her new home for about 2 months now and is doing really well (i put her favorite couple pieces of driftwood in with her to make her feel comfortable). It's not so much that she is lonely but I think the tank looks lonely with just her in it.