New research centers around the diminutive regal damselfish, found in non-native waters in the southern Gulf of Mexico. Damselfish are some of the most beautiful fishes in the ocean, and that's why they are so attractive to those who want a saltwater aquarium in their home or place of business. But there's a bit of a concern when it comes to one damselfish species -- it is starting to pop up in a part of the ocean where it doesn't really belong....