i've had mine for about 4 years never any problem with them.. they are quite peaceful and are always out, hovering as others have said, but nevertheless out...
i really like them.. here are mine....
At night shine a single bulb light source directly down on them and they produce a shadow that looks like a shark. My daughter caught site of this one night as he swam under a LED. The light has to be directly overhead for it to work.
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