I have a ten gallon mini reef and I have two possibly three Mithrax crabs in there eating my bubble algae. I JUST added a banded coral shrimp tonight and I read that they can be aggressive towards other crustaceans. I saw them cross one another's path and they did not interact violently but rather passed each other by. I also have soft corals growing in there and I've heard the coral shrimp may pick on them and inadvertently spread more coral around the tank?? Any truth to this?