Yeah they shoot those runners out like crazy! My long spined sea urchin loves to munch on them. Honestly, I haven't had to touch them since I've added that guy over 6 months ago. I started feeding it strips of nori because he decided to started to munching on other things too.I got some of those. They r beautiful, but dang they grow fast and right over Zoa colonies and others. They r relentless growers. I had to do quite a bit of gardening to mine and they almost completely died off. Month later have 100 more. Super cool lookin weed. Haha