After my tank finished cycling, I got 2 damsels. One blue damsel, and one black and white stripped damsel. The black and white one is way too aggressive, and I would really like to return him. The problem is that I CAN'T CATCH HIM! I have been trying for almost 3 days now...and still luck. Are there any tricks to catching fish. He immeditaly takes refuge among the rocks and caves etc...HELP!!!