Agree for sure on needing more than one , however 1 per 10 gallons is a little extreme I would say. I've used 5 on a 100g system a couple times with success. Have you witnessed a wrasse eat one before ? I've used them before with a tank full of wrasse , and I've seen the wrasse put one in his mouth , but quickly spit it out. From what I've read they taste horrible because all they eat are aptasia , not sure who figured out they taste bad though ? Lol
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