Just got a strawberry crab from Irwana yesterday today I see it munching on my LOTR zoa..... But this zoa never open for quite sometime about 13-18days (due to a tank crash about 3wks ago). Now I am worried it will eat the rest of my zoas. As some can clearly see slightly are opening up. Is it actually helping to "clear" dead zoas or becoming a pest? Anyone have this problem too?