5inch cross hatch triggers

You should be fine, I'd only be concerned with them maybe picking at small little fish that are bite sized. Anything much bigger than their mouths, especially fish like tangs, will not even be considered as something edible.
 
I would say you are unlikely to find 5 inch Crosshatch as you can't differentiate Male and Female at that size I don't believe. They are not going to eat Tangs, but in my personal experience having a pair right now, 120 gallon is FAR too small a tank for Crosshatch. My Male makes my 240 look small. He paces the tank more than my same sized Sohal Tang, which is saying a lot.
 
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