Having a fish that eats all your bristle worms isn't necessarily a good thing. Bristle worms are EXCELLENT members to a CUC and can be very, very beneficial to your tank. I also wouldn't consider having a fish for only three months a success. While Possum wrasses are very hardy, there are plenty of other wrasses that are as well. Flashers and fairies are known jumpers, that's the big issue with them, but if the tank is properly covered, they're usually a very good, moderately easy to keep fish.