Hello, I recently introduced a tiger pistol shrimp to a 75 gallon tank with a small yellow watchman goby already in it. They seemed to have paired on day 1 but the goby is now constantly out of the hole. I have noticed new fresh bruises today and later noticed that when the goby got close to the shrimp's hole, the shrimp started pinching it! The yellow watchman goby wasn't doing the best before adding the shrimp either, it is pretty weak and skinny. Any advice for what I should do?