Hardest working? ...uhm Thats got to be the little two spot goby (my daughter calls hims Spotsy Jumpy). Pound for pound no one does more. That little sand sifter has a 6 foot, 135 gallon area all to hisself and he keeps it cleaner then I ever could.
Oh and not to forget the peppermint shrimp, wonderful aiptasia eaters, they love those weeds.
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