I lost a firefish on Monday and I’ve been trying to figure out what happened and this is the best theory I can come up with. I bought a yellow rose goby and candy cane pistol shrimp pair and the firefish all last Saturday. I took my time to acclimate all of them and my firefish was doing great on Saturday and Monday morning. He was exploring the tank and had no signs of stress or disease. I came back home Monday to find him pretty beaten up and dead right next to his hiding place under one of my rocks. My pistol shrimp had gone under a rock on the other side of the tank so I didn’t suspect him at first, but a couple days ago I found him and the goby under the rock where my firefish had been hiding and was found dead. Is it possible that my pistol shrimp moved rocks on Monday and killed my firefish to get him out of the spot? Since it was within 48 hours after I bought my firefish that I found him dead, I am able to get a replacement fish but should I be looking for a fish that won’t hide under my rocks? I would really hate to have another death