Duncan versus Aussi Acan?

Is coral fighting becoming a game sport? A duncan tentacle gets stuck in my acan every once in a while. I have never seen my duncan sting my acan. The most the acan does is try and eat the duncan tentacle.
 
yes it a sport i let my corals fight each other to find the dominant coral in my tank kings of the corals.
 
it happened in my frag tank. aussie acan won every time. until the aussie met acan maxima...(lost 2 colonies to 1 polyp of the acan maxima.)
 
the only reason i ask is because the ducan stung my aussi acan the other day and kill two ployp of my nice rainbow ones.
 
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