That I think was one of the problems that I had with my first one.
My cleaner shrimp wouldn't leave it alone, and the hare finally started to bury itself in the sand. Now, I don't know whether this was to get away from the shrimp, or other reasons. It died.
Second one I had, cleaner shrimp let it alone, but it also passed.
Luckily, nether had inked my tank, but they are cool tank inhabitants.