I need to remove six line wrasse from my reef tank. I’m going to do it simply with a soda bottle trap.  I will also use it to trap a peppermint shrimp for demonstration purposes. It can be extremely difficult to remove sick or aggressive fish or invertebrates from your reef tank.  rather than knock things over or start disassembling your tank, you can assemble a soda bottle trap for free. It is an effective way to catch and relocate shrimp, fish, or crabs.