I agree with amphiprion. DON'T BUY THEM!!! They eat only particulate foods within a narrow range of size, and require daily feedings to remain alive! It is very, very, very, very, very difficult to keep these alive for more than 7 to 8 months in an ordinary tank. DO YOU GET IT!
Sorry So Blunt,
Jay1
Please learn from those who have been there before you. Research before you buy! Resist the urge to impulsively purchase livestock without researching it. Do not assume the man at the fish store knows what he is talking about; he probably is full of detritus.