Hi all, I don’t know how, but I manage to have a tank that is making impossible new additions. It seems to be a quiet tank, with only a few occasional chasing (coral beauty chasing the dotty and the purple tang chasing the powder brown tang) that luckily does not escalate. I decided to stop adding any fish until I solve the aggression problem that I'm currently having. What do you think can be done to solve this situation? Tank 340 lts (app 96gal) + sump (115cms*60cms*50cms) 2 years old tank Inhabitants Ocelaris 1 (first fish in the tank) Randall Goby (second fish in the tank) Springeri dottyback (third one) Coral Beauty (fourth) Powder brown tang (fifth) 2 green Chromis out of initial 5 Purple tang (Last) FAiled introductions Blue Flasher, It lasted 2 days before I found it dead lying over the egg-crate that covers the tank. I saw some level of aggression from Dottyback and Coral Beauty, but though it might go away with time, wrong from my part. Having in mid that the fish is a known jumper, I didn´t though it was that serious. The second event lead me to think I have a bigger problem. Second event Gramma Loreto I expected certain level of aggression from the Dottyback, so I introduced the gramma using a acclimation box for 5 days. By the end of the 5 days, the Dotty didn’t even bother the gramma in the box. When I released it into the tank, the problems began almost immediately. The dotty start chasing the gramma (expected), but then the coral beauty start chasing it. Finally the CB cornered it on a hole, but it didn’t stop there, it was triying to get in the hole to keep biting it (like the movies when the dinosaur is trying to get in the cave where the protagonist is hiding). Later on the gramma tried to escape and the PBT start chasing it biting his tail. After seeing this I manage to get it out, and now is trying to recover in the acclimation box. On a side note, I think the chromis are being bullied, they do not swim around as much as before.