How many wrasses in each tank?

i would introduce them and turn off the lights at the same time also being sure that the others are well fed before the introduction . never feed for the first day and be sure and be wise to each wrasses and their requirements before you purchase .
 
the tonos is also known to be pretty aggressive also

Do you think I'd be ok putting one in my 180 reef that has mostly bigger tangs and butterflies? There aren't any really peaceful fish in there except for a banggai cardinal who I am going to be removing for breeding purposes.
 
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