All right I hate to be the one to say this but you REALLY need to slow down and learn about what fish are compatible and what aren't in your size tank. I can guarentee you that trigger in the near future will kill the Shark and both Scooter Blennies, and would have killed the Dwarf Lion and the filefish. Treating a main tank is a no no, and agree with everyone else that when you add carbon there is no more meds. So I think you learned a major lesson and I would suggest if they all survive either returning the Trigger and Shark, or the Shark and the Scooters. IMO keeping a shark in a 55g tank is cruel. They may not be very active but they are active enough to not work in a 55. Plus you are lucky because Sharks, Rays, and Eels can not handle medicines so be thankful you put carbon in the tank and DO NOT retreat with the Shark in there. It will kill him. Anyway, hope this helps.