I'm sorry that I cannot get a picture of it. Everytime I try it's just way too blurry so maybe you guys can assist me with just a description? The macro that I found in the tank is shaped like a spade or maybe a diamond with rounded side points. It's green and does not look calcified or anything and is flapping in the current. I tried to find a similar pic online with no luck. I know that I have red kelp growing but I just cannot find an image similar to the green macro I have. I would guess at juvenile caulerpa however it is nowhere near fern-like. If not then I will try sometime this week to borrow someones camera.