I believe nics would work with rainbows, they are not piscavores and tend to remain close to the substrate, unlike rainbows which prefer mid to higher areas of the water column.
They do take a while to color up, but as you can see with Black Tunas, they become quite beautiful.
I picked up a 1.5" group of 8 nics back in May this year, they looked like this back then.
they are now between 3"-5" and look like this, I have the group in a 75 gal tank, so far aggression is minimal
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Beautiful male you have there. Any breeding yet?
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