SixLine Wrasse or Firefish?

Christmas is coming and I plan to do up my 20g saltwater tank. I plan to have Cerith snails, 2 Large (2'') hermit crabs, Corals, A cleaner shrimp and 1 more fish, It's either going to be a Six line wrasse or a Fire fish. I like the six line wrasses energy around the tank and the way they sleep but I also like the calmness of a Fire fish. I've read that the six lines can end up killing small crustacians and more importantly my feather duster and I also read that the firefish have a tendency to jump out of the tank. Which one do you think would be best?

I have 2 Occellaris Clowns, A feather duster, Snails and a few small hermits

Well I won't have a top... So I think it will be a six line, I'll have to think though. I can just change it if it gets aggressive even though it's going to be hard work If I try to take it out.

Inglorious said:

Is it possible to have both if the tank has enough space?

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Can't. the tank already has 2 Clowns in it.