Clove polyp Containment Question.

[JMcNs]

So I have a colony of clove polyps isolated on a small rock that are growing great. The problem is that the rock is about 1.5" away from the main aquascape and the polyps are shooting out an arm to the rock work (not observing social distancing). I cut the arm off about 2 weeks ago and now its back. So what I'm looking for is a more aggressive coral that I can place on the rock that might bully it away from overtaking my whole aquascape. It's only a 10 gallon system so I don't have much geography to work with and cannot distance the rock any further away.

 

[reef lover]

Some mushroom corals might be untaseful enough to keep the cloves away...without being overly aggressive.