Need an ID please. Also unsure of its invasive capabilities. When I bought out a system today it was in the fuge...thought it was caulerpa till I looked closer.
More Specifically Caulerpa Serullata. I keep about 15 different species of macro algae. many of them include various Caulerpas. The Caulerpa Serullata seems to be the slowest grower and least likely to grow out of control from my experience. I would not worry much at all.