I.D. Please

[mike31154]

First pic looks like either a Nassarius snail or Whelk snail. Nassarius are good sand stirrers and generally stay there during the day. If it's a Whelk it may be less desireable since it will get much larger, is carnivorous and will eat clams.

Second is a crab, can't tell what kind from the picture. Some are better than others although many people remove any and all crabs from their display tanks.

Not sure about #3, Mojano Anemone perhaps? If so, again mixed reviews. Some folks consider them pests since they can multiply quickly and take over, others seem to like them and not have a problem.