are there any triggers that will be ok in a community tank with snails, crabs, and shrimp? or is this just a dream? also can i get a dwarf lion fish with the fish i have(listed in my sig)?
Lions are "technically" reef safe. But, they will eat smaller fish, and shrimp might be in danger too.
As far as Triggers and everything you listed... all I can say is:
That's like a buffet for 'em.