I would keep it simple Matt... Especially because you have tangs... Don't put any stress on them.... They get stress very easily.
I tried them twice and never had any luck. Chromis are peaceful and they swin toguether.
I said it before and I'll say again.... I think Juan worked for sea world and didn't tell anybody....... He is just showing off all the knowledge....I'm with Lou next thing is building a tank for dolphins
They should be able to pair if not already.... Maybe somebody with more expertise can tell us. Percula and onyx are not that much different... Tanks is looking great , keep us updated.
Roger tank is looking good !!!.... Is a hairy mushroom I have one probably about same size and is hosting my clowns... They love it like a anemone. Your clown looks like a false and the other one like a onyx clown.