Decades ago, many hobbyist wanted some type of marine plant in their tanks, and the had no ideas at first on what they might have. Then one day, a new type of plant algae was invented, someone back then made a plant algae from mixing a wide selection of items in order to create one. Even myself back then had some interest in a marine plant, but I took my time in deciding to have it or not. I learned that this plant grew fast, extremely fast, and decided shortly after that I wouldn`t have it.
This algae plant is the same algae that was spoken about years ago, overseas. That they only found one small sea creature who could feed of from this. Years after, they had to find away in how to destroy this plant, before it over ran/growth the ocean floors.
Yes, if you any algae to dump, put it in the trash can, and not flush it into the oceans. Another was so many years ago, people dumped their lionfish in the ocean, where it never would ever be seen, not until some hobbyists didn`t want their lionfishes anymore.