Don't know where to start
#1
Hi all, I have found a strange creature in my nano tank, its about 3cm in length, purple'ish is living in a crevice in the live rock (which is about 2cm deep) amongst some mushrooms, it appears to be roughly the same shape as a mussel on edge but with more prominent futures, it has a mouth at the front, when the mouth is open it splits into three with a single bottom jaw and two upper jaws split half way along the top of the shell. Sorry for the poor photo but you can just see it behind the skunk shrimp in the photo (with mouth open).
Any help identifying it would be greatful.
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If it's happening fast, its not in a marine tank