Skip 6-line. Almost everyone I know who has them or had them found them very aggressive towards their more peaceful fish once they settled into the tank. Lots of threads on "How do I catch a 6-line?" to back this up.
I really like yellow canary wrasses as pest controllers.
Love leopard wrasses, although these are not particularly easy fish to acclimate to captivity. I find blacks are far easier to keep long term than the other colour variations.
Most fairy wrasses are jumpers. Love them but its painful finding carpet surfers or crispy cat treats on the glass lids.
Candy hogfish are colourful and generally peaceful & hardy.
Anthony
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