They are super aggressive once introduced into our tank. I believe CW's territory is much larger than any typical tanks thus unless it is a proven pair, its hard to pair them in our tanks.
Several attempts has been made to pair them but to no long term results, initially some feels that they are sexually dimorphic, i.e. male with golden head. I have tried and have failed. Without more proven results, I refrain from encouraging reefers to try to form pairs with CW.
Let's not forget, CW was considered a "no no" fish to keep several years back and it was only the recent 5-8 years that we are having good results.