Hi, Lauren-
How about one of the fairy wrasses? Though expensive they are very very beautiful.
Centropyge angels are also a good addition, though they may occasionally nip at corals. Centropyge argi is a pretty little jewel though that has a very good reputation. Personally i've never had a problem with any of the centroyge though.
I wouldn't recommend putting another tang in a 46. There is bound to be problems with the y.t.
I'm sure somebody else will chime in with good suggestions!
HTH, Becca

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240 gallon glass mixed reef 2x 250 watt m.h., 2x 175 watt m.h., 3x 110 watt vho's.
55 gallon propagation tank, 2x 96 watt pc's
Empty 125 gallon tank
reefer girrrl!