Help me ID please.

I bought a snail thinking its a conch...maybe a whelk? i dont see him go on the sand, i just see him either on the glass or on the rocks. Its very slow and doesnt do much. I did see him on top of my turbo snail, but it didnt kill him.
Heres some pictures:




Also saw this worm looking thing... anyone know what this is? good or bad? Looking at this website:Worm Hitch Hikers... it might be a ribbon worm or Sipunculida worm
YouTube - Saltwater Unknown worm? 1

 

Not sure about your snail but the worm is a peanut worm and perfectly harmless

 

thanks for the quick response..

and bout the snail.. i think its a Urosalpinx cinera/oyster drill Exotics Guide.
Or a whelk Identify This...Conchs and Whelks - Reef Hobbyist Online Magazine
It has the same eye and antennae.


I'm gonna remove it before it kills anything.

 

It looks to me like more than one worm, over to the right of the one there is another thing that look like a worm also, only on the 1st pic not on the 2nd. the snail look like an astrea of some sort