I have 2 mated firefish in my 110 tank and my wife had to have an orchid dottyback. So about 2 weeks ago I added an orchid to the tank and since my firefish have nearly disappeared except at feedings. That was when yesterday I saw the dotty picking on my firefish. I'm going to remove the dotty, but I have spent 2 hours trying to catch him. Any recommenedations on how best to catch him?