That is indeed a Tiger pistol shrimp (Alpheus bellulus) and a pink bar goby. They're called different things depending on what availability list I look at. Either way, damn nice pair and loads of fun to watch. 1 word of caution though, make sure that your rockwork is on the bottom of the tank. Those little guys do nothing but dig. He could cause a rockwork collapse ending in disaster. I'm sitting here right now watching my Yellow Watchman gobies and their tiger shrimp.