I think if the bone is gone (where all the tail bones/cartilage grow from), then parts after that will not grow back. In this case I don't know if much would grow back there at all. But like Christy I might be talking out my behind too.
Definitely looks like a dropped tail for some reason. That looks very similar to the end of a lizard's tail right after a drop.
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No more tanks  - Laying off the ReefCrack for awhile!
Cheers,
Chris
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