Mixing reef safe triggers?

[brad23]

I have a small male and a 6 inch female blue throat in a 75g and was wanting to pick up a crosshatch. I'm not sure if they will work in a tank that small or not?

I am setting up a 180g but that is still another 2 months out.

 

[heartbreak7]

I would definitely wait, most crosshatches available are 6" + specimens, and very active fish, these won't work in the 72 gallon.