We're trading in our maroon clown to our LFS for store credit. She's just too mean and has killed the last two fish we have added. Problem is, I can't catch her. 140 gallon tank with lots of rock work. I've been trying a fish trap but she's not a very aggressive eater so the other fish swim in first and then push the food out so she just sits at the opening eating. Have also tried catching her sleeping in the news at night with no luck. Any other suggestions?