I have two colonies - a cali tort and a blue millie - that I purchased attached to the same rock (both are fully encrusted). I noticed recently that one branch of the tort and one branch of the millie have grown to the point where they are now touching, and the tip of the tort branch is now totally white, presumably a victim of the millie. My question is, should I do anything about it? Like cut off the tip of the tort, or should I just leave it be? I just want to make sure it's not going to affect the rest of the colony.