Good thing you are far away if not you have to buy me a pack of cigarettes

... just kidding. Ok, here is what I did for the last 10 years. While you are floating the bag with 2 or 3 new fish in the sump (remember no less than 2 fish, the more the better, and I always do at night) feed all your fish then turn off all lights, including your room's light, except the moon lights are still on. After you acclimate your new fish properly, you release them in your tank and turn off the moon lights immediately so the previous fish have no chance to attack or see the new comers. You need a very WEAK flash light not too bright to get out of the room though because it will be totally dark. Do not turn any light back on till the next morning, and voila ... done. I can add as many as I want to by doing this way for so many years.