Snail ID - what the heck is this?

[canuckzilla]

I've had my reef tank almost a year now and new things are still popping out. I haven't been able to id this snail that showed up last month. Looks like a conch but really...I have no clue.

What the heck is it and is it predatory?

http://www.canreef.com/photopost/data/500/1335Snail_ID.jpg?9482

[albert_dao]

It's probably one of those predatory murex-ish snails.