Hey i just came accross a good deal i had a friend that was breakin down his tank and he gave me his horseshoe crab it is about 4 inchs around he sure is a neat addition to the tank but i know little about them and he has already stuck me with his tail while i was removing some old seaweed so i guess i have learned they will poke you. but is there anything else i need to know that i will not find in the book. like do i need to feed one this big the guy i got him from said he didn't feed him but he had a diifrent type of fish than i do he had a shark and a moray in his tank and i know they waste alot of food not like my little fish thanks for the info