Yes the more i read about it the more i think it may be a mistake it basically eats all the fauna, from bacterias, mini crustacians , as well as detritus and extrafood and snails shrimps, and destroys the fabric of the sand beds. Which some don't recover, it may be a mistake to have one in my 150g. I don't want my whole fauna to disapear, I wanted a starfish that churn my sand properly and get the extra bits but not a vacum cleaner lol. Thanks.