regarding hitchikers - I would say their survivability largely depends on where you're buying from and how they handle their rock. Not to mention the condition of your tank. Hikers make things very interesting though - I'm still trying to identify a crab that hiked in on my marshall rock, he never comes out, all I ever see are his claws searching for food. Of course there are some hikers that are unwelcome for many reefers.
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