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.
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