I've noticed over the past few months that my green brittle starfish will be missing the very tips of his legs. I assume they were maybe bitten off by a fish or perhaps from a crab - or maybe it was just a natural process. Today as the lights clicked on I found that the entire leg, all the way down to his body, was gone. His legs are thicker than a pencil, and there is nothing in my tank that could do that. Is this a natural reaction to a problem with my water, or some other factor?
