There is no such thing as perpetual motion. It is ludicrous to believe that a tank, especially a marine environment would survive like that.
BTW, read the first review, "not as good as you think"...I agree with that review above all others.
I was gifted one. Introduced me to fishkeeping. They were active seemed healthy. Sparsely decorated. Mine lived for over a year n died in a heat wave.
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