I've had tiger tails (they divide once in a while) for several years. They do a great job keeping the sandbed clean. They always hiding under rockwork with there head extended and are constantly vacuuming the sandbed, ingesting it in one end and out the other. The annoying thing is that the sand tends to accumilate at the back of the tank and below rockwork. (I can see thae glass bottom at the front of the tank, the back is about 3 inches deep) Other than that I have never had any probems with them.
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