Save your money and grief. Buy from a well known Manufacturer. I have one of their (protein0smikker.com) HOB Profuge setups. The intake broke 6 months after I got it and they dont respond to emails asking for replacement purchase. of course, it's not standard piping, it's custom made so I cant...
Here is the answer from a reffcentral post:
It's an aeolid nudibranch, all of which feed on cnidarians. This guy is probably Phyllodesmium briareum, which feeds on green star polyps. Whether it's good or not depends on who you ask (I love them personally, and I've actually been trying to find...
I found it crawling on the back wall. I caught in a net and some of the arms broke off it and are wriggling in the net. Is this a bad animal or a good animal?? It's freaky looking.