Just wondering if I can add a pistol shrimp and yellow watchman to my 90 gallon which already has a lawnmower blenny on it. (Didn't want to hijack the other thread with a similar question). Also, as much as I love the pair if it is inevitable that the watchman and blenny would not get along would I be fine to add just the pistol shrimp. He seems like such an entertaining addition or would I be better with something like a cleaner shrimp? Thanks in advance for any help.