I have a purple Dotty back that has become a serious problem in a just a few short days. It has harassed my Clown fish and is now trying to destroy a Dwarf Angel. This little purple devil fish has no issue chasing my Cardinals that are over 3 times its size. I would like to get rid of this periwinkle problem as soon as possible but the net has proved a impossible way to catch the fish. Last night i attempted to move my live rock to catch it and the fish vaporized. No kidding vanished without a trace. looked in the rock while i had it in a bucket, searched in any obstacle left in the tank, even looked in the overflow. I assumed after 2 hours of hard searching she managed to escape into the plumbing somehow or jump out and i missed it. I put my tank back together and watched for several more hours. NO Dotty!!! At this point i was almost relieved thinking she was done for somewhere on the way to my sump. This morning I got up and swimming around my tank was the little purple devil. I am trying to catch the F*&$er but having no luck. Please give your best advise for catching this pest. I currently have a bottle trap set up but my puffer seems to be the only fish willing to swim in.