Robbz Olson is one of the hosts of the Aquarium Guys Podcast. Although mostly focused on aquarium fish, The Aquarium Guys also do “out of the tank” episodes covering related topics, like fishing. I was recently invited to join them to talk about fly fishing, and now Robbz is returning the favor. As an avid aquarium hobbyist, Robbz has (perhaps unfortunately) become quite familiar with the issue of invasive species around the country, as many of these species can trace their history back to the aquarium world. We discuss several impactful invasive species, how these species are a detriment to wild environments in a variety of ways, and some ways people have tried to combat the issue.