When tigers get big they can sometimes get pretty mean. Funny story - when I first started reefing my LFS sold me a non symbiotic pistol claiming it would definitely pair up with my goby. This thing was a monster in my tank for years I could not get it out! It even hit me once or twice.My yellow watchman is the only thing in my tank that is safe from my tiger pistol shrimp. Sandsifter star murdered, emerald crabs gone, blue legs and peppermint shrimp learned real fast that his hole was off limits, my brittle star which is pretty good size is always regrowing the tips of his arms. Rock scape it's his to do whatever he pleases, move half the sand bed from one side to another and bury half the tank no problem he is on it.