Hi everyone, This is our first post on any forum ever, and we are new to the hobby (3 months), so please bare with me and forgive my lack of proper terminology and general knowledge on certain things tank related. I got my boyfriend a 13.5 gallon fluval evo salt water tank back in September, so it is really his tank, but I help with certain things and I love it just as much as he does (I look forward to getting a tank of my own in the near-future, but I want us to first learn with the one we have). So at the time of our two fish's deaths, we had a misbar black ocellaris clown, a misbar ocellaris clown, a purple firefish, a yellow watchman, some corals, a peppermint shrimp, pistol shrimp, porcelain crab, and some other crabs and snails (cleaner crew). The two clowns seemed to be pairing already the day after we introduced our black clown into the tank. Then our orange clown began getting hosted by our open brain coral, and he didn't leave it alone for three days- not even to eat. About a week later, he left the coral and was swimming around again, but he wasn't the same as he used to be. He would swim around very slow, and would float onto his side a lot. A week went by and then he went back to the coral. A few days later, we noticed that our purple firefish had wounds on him (pictures attached) and he was staying close to the substrate. The orange clown began to hover over him (picture attached, because I couldn't figure out how to attach a video). We put him in a little breeding compartment on the side of the tank, (inside of the tank- isolated from everyone else) and the next morning, the firefish was dead. Two days later, our orange clown was laying on the substrate on his side, barely moving. He had no wounds that I could see, but the next morning he was gone. My boyfriend thinks that maybe the black clown was bullying these two fish, but I have never seen him show aggression towards any of our fish, not to mention that the two clowns seemed to really like each other. I feel like the open brain coral has something to do with our orange clown's death, because he was never the same after the hosting. Any ideas on what could have happened?? Please let me know what other information you need about the tank! Thank you in advance!