Theoretically both niger and spotted puffer feed on starfish in the wild, and CC should be a goner in no time. But, I've kept CC with Bursa trigger and many puffers, and they did fine until it died from osmotic shock. Niger is one of more peaceful triggers. So you can try it at your own risk. Spotted puffer will not kill CC, but it'll definitely pick at chocalate chip part of starfish. No permanent/major damage, though. Hope this helps.